chore(rds): deprecate Aurora PostgreSQL versions 12.11-21, 13.7, 13.8, 13.10, 13.17, 14.3-5, 14.7, 14.4, 15.2, and 15.9 (#34444)

### Reason for this change

Some Aurora PostgreSQL versions have been removed from available engine versions.

### Description of changes

Deprecate following Aurora PostgreSQL versions:
- 12.11, 12.12, 12.13, 12.14, 12.15, 12.16, 12.17, 12.18, 12.19, 12.20, 12.21
- 13.7, 13.8, 13.10, 13.17
- 14.3, 14.4, 14.5, 14.7, 14.4
- 15.2, 15.9

### Describe any new or updated permissions being added

N/A

### Description of how you validated changes

``` console
$ aws --region us-east-1 rds describe-db-engine-versions --engine aurora-postgresql --query 'DBEngineVersions[].EngineVersion'
[
    "11.9",
    "11.21",
    "12.9",
    "12.22",
    "13.9",
    "13.11",
    "13.12",
    "13.13",
    "13.14",
    "13.15",
    "13.16",
    "13.18",
    "13.20",
    "14.6",
    "14.8",
    "14.9",
    "14.10",
    "14.11",
    "14.12",
    "14.13",
    "14.15",
    "14.17",
    "15.3",
    "15.4",
    "15.5",
    "15.6",
    "15.7",
    "15.8",
    "15.10",
    "15.12",
    "16.1",
    "16.2",
    "16.3",
    "16.4",
    "16.4-limitless",
    "16.6",
    "16.6-limitless",
    "16.8",
    "16.8-limitless",
    "17.4"
]
```

### Checklist
- [ ] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: Tietew

packages/aws-cdk-lib/aws-rds/lib/cluster-engine.ts

@@ -962,27 +962,60 @@ export class AuroraPostgresEngineVersion {
    * @deprecated Version 12.10 is no longer supported by Amazon RDS.
    */
   public static readonly VER_12_10 = AuroraPostgresEngineVersion.of('12.10', '12', { s3Import: true, s3Export: true });
-  /** Version "12.11". */
+  /**
+   * Version "12.11".
+   * @deprecated Version 12.11 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_11 = AuroraPostgresEngineVersion.of('12.11', '12', { s3Import: true, s3Export: true });
-  /** Version "12.12". */
+  /**
+   * Version "12.12".
+   * @deprecated Version 12.12 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_12 = AuroraPostgresEngineVersion.of('12.12', '12', { s3Import: true, s3Export: true });
-  /** Version "12.13". */
+  /**
+   * Version "12.13".
+   * @deprecated Version 12.13 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_13 = AuroraPostgresEngineVersion.of('12.13', '12', { s3Import: true, s3Export: true });
-  /** Version "12.14". */
+  /**
+   * Version "12.14".
+   * @deprecated Version 12.14 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_14 = AuroraPostgresEngineVersion.of('12.14', '12', { s3Import: true, s3Export: true });
-  /** Version "12.15". */
+  /**
+   * Version "12.15".
+   * @deprecated Version 12.15 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_15 = AuroraPostgresEngineVersion.of('12.15', '12', { s3Import: true, s3Export: true });
-  /** Version "12.16". */
+  /**
+   * Version "12.16".
+   * @deprecated Version 12.16 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_16 = AuroraPostgresEngineVersion.of('12.16', '12', { s3Import: true, s3Export: true });
-  /** Version "12.17". */
+  /**
+   * Version "12.17".
+   * @deprecated Version 12.17 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_17 = AuroraPostgresEngineVersion.of('12.17', '12', { s3Import: true, s3Export: true });
-  /** Version "12.18". */
+  /**
+   * Version "12.18".
+   * @deprecated Version 12.18 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_18 = AuroraPostgresEngineVersion.of('12.18', '12', { s3Import: true, s3Export: true });
-  /** Version "12.19". */
+  /**
+   * Version "12.19".
+   * @deprecated Version 12.19 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_19 = AuroraPostgresEngineVersion.of('12.19', '12', { s3Import: true, s3Export: true });
-  /** Version "12.20". */
+  /**
+   * Version "12.20".
+   * @deprecated Version 12.20 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_20 = AuroraPostgresEngineVersion.of('12.20', '12', { s3Import: true, s3Export: true });
-  /** Version "12.21". */
+  /**
+   * Version "12.21".
+   * @deprecated Version 12.21 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_12_21 = AuroraPostgresEngineVersion.of('12.21', '12', { s3Import: true, s3Export: true });
   /** Version "12.22". */
   public static readonly VER_12_22 = AuroraPostgresEngineVersion.of('12.22', '12', { s3Import: true, s3Export: true });
@@ -1006,13 +1039,22 @@ export class AuroraPostgresEngineVersion {
    * @deprecated Version 13.6 is no longer supported by Amazon RDS.
    */
   public static readonly VER_13_6 = AuroraPostgresEngineVersion.of('13.6', '13', { s3Import: true, s3Export: true });
-  /** Version "13.7". */
+  /**
+   * Version "13.7".
+   * @deprecated Version 13.7 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_13_7 = AuroraPostgresEngineVersion.of('13.7', '13', { s3Import: true, s3Export: true });
-  /** Version "13.8". */
+  /**
+   * Version "13.8".
+   * @deprecated Version 13.8 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_13_8 = AuroraPostgresEngineVersion.of('13.8', '13', { s3Import: true, s3Export: true });
   /** Version "13.9". */
   public static readonly VER_13_9 = AuroraPostgresEngineVersion.of('13.9', '13', { s3Import: true, s3Export: true });
-  /** Version "13.10". */
+  /**
+   * Version "13.10".
+   * @deprecated Version 13.10 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_13_10 = AuroraPostgresEngineVersion.of('13.10', '13', { s3Import: true, s3Export: true });
   /** Version "13.11". */
   public static readonly VER_13_11 = AuroraPostgresEngineVersion.of('13.11', '13', { s3Import: true, s3Export: true });
@@ -1026,21 +1068,36 @@ export class AuroraPostgresEngineVersion {
   public static readonly VER_13_15 = AuroraPostgresEngineVersion.of('13.15', '13', { s3Import: true, s3Export: true });
   /** Version "13.16". */
   public static readonly VER_13_16 = AuroraPostgresEngineVersion.of('13.16', '13', { s3Import: true, s3Export: true });
-  /** Version "13.17". */
+  /**
+   * Version "13.17".
+   * @deprecated Version 13.17 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_13_17 = AuroraPostgresEngineVersion.of('13.17', '13', { s3Import: true, s3Export: true });
   /** Version "13.18". */
   public static readonly VER_13_18 = AuroraPostgresEngineVersion.of('13.18', '13', { s3Import: true, s3Export: true });
   /** Version "13.20". */
   public static readonly VER_13_20 = AuroraPostgresEngineVersion.of('13.20', '13', { s3Import: true, s3Export: true });
-  /** Version "14.3". */
+  /**
+   * Version "14.3".
+   * @deprecated Version 14.3 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_14_3 = AuroraPostgresEngineVersion.of('14.3', '14', { s3Import: true, s3Export: true });
-  /**  Version "14.4". */
+  /**
+   * Version "14.4".
+   * @deprecated Version 14.4 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_14_4 = AuroraPostgresEngineVersion.of('14.4', '14', { s3Import: true, s3Export: true });
-  /** Version "14.5". */
+  /**
+   * Version "14.5".
+   * @deprecated Version 14.5 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_14_5 = AuroraPostgresEngineVersion.of('14.5', '14', { s3Import: true, s3Export: true });
   /** Version "14.6". */
   public static readonly VER_14_6 = AuroraPostgresEngineVersion.of('14.6', '14', { s3Import: true, s3Export: true });
-  /** Version "14.7". */
+  /**
+   * Version "14.7".
+   * @deprecated Version 14.7 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_14_7 = AuroraPostgresEngineVersion.of('14.7', '14', { s3Import: true, s3Export: true });
   /** Version "14.8". */
   public static readonly VER_14_8 = AuroraPostgresEngineVersion.of('14.8', '14', { s3Import: true, s3Export: true });
@@ -1054,13 +1111,19 @@ export class AuroraPostgresEngineVersion {
   public static readonly VER_14_12 = AuroraPostgresEngineVersion.of('14.12', '14', { s3Import: true, s3Export: true });
   /** Version "14.13". */
   public static readonly VER_14_13 = AuroraPostgresEngineVersion.of('14.13', '14', { s3Import: true, s3Export: true });
-  /** Version "14.14". */
+  /**
+   * Version "14.14".
+   * @deprecated Version 14.14 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_14_14 = AuroraPostgresEngineVersion.of('14.14', '14', { s3Import: true, s3Export: true });
   /** Version "14.15". */
   public static readonly VER_14_15 = AuroraPostgresEngineVersion.of('14.15', '14', { s3Import: true, s3Export: true });
   /** Version "14.17". */
   public static readonly VER_14_17 = AuroraPostgresEngineVersion.of('14.17', '14', { s3Import: true, s3Export: true });
-  /** Version "15.2". */
+  /**
+   * Version "15.2".
+   * @deprecated Version 15.2 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_15_2 = AuroraPostgresEngineVersion.of('15.2', '15', { s3Import: true, s3Export: true });
   /** Version "15.3". */
   public static readonly VER_15_3 = AuroraPostgresEngineVersion.of('15.3', '15', { s3Import: true, s3Export: true });
@@ -1074,7 +1137,10 @@ export class AuroraPostgresEngineVersion {
   public static readonly VER_15_7 = AuroraPostgresEngineVersion.of('15.7', '15', { s3Import: true, s3Export: true });
   /** Version "15.8". */
   public static readonly VER_15_8 = AuroraPostgresEngineVersion.of('15.8', '15', { s3Import: true, s3Export: true });
-  /** Version "15.9". */
+  /**
+   * Version "15.9".
+   * @deprecated Version 15.9 is no longer supported by Amazon RDS.
+   */
   public static readonly VER_15_9 = AuroraPostgresEngineVersion.of('15.9', '15', { s3Import: true, s3Export: true });
   /** Version "15.10". */
   public static readonly VER_15_10 = AuroraPostgresEngineVersion.of('15.10', '15', { s3Import: true, s3Export: true });