Downgrade to Kotlin 1.9.x version

Author: alexcheng1982

pom.xml

@@ -39,6 +39,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.compiler.source>17</maven.compiler.source>
     <maven.compiler.target>17</maven.compiler.target>
+    <kotlin.version>1.9.25</kotlin.version>
     <kotlin.code.style>official</kotlin.code.style>
     <kotlin.compiler.jvmTarget>17</kotlin.compiler.jvmTarget>
     <spring-ai.version>1.0.0-M5</spring-ai.version>
@@ -125,7 +126,7 @@
       <plugin>
         <groupId>org.jetbrains.kotlin</groupId>
         <artifactId>kotlin-maven-plugin</artifactId>
-        <version>2.1.10</version>
+        <version>${kotlin.version}</version>
         <executions>
           <execution>
             <id>compile</id>
@@ -184,7 +185,7 @@
     <dependency>
       <groupId>org.jetbrains.kotlin</groupId>
       <artifactId>kotlin-test-junit5</artifactId>
-      <version>2.1.10</version>
+      <version>${kotlin.version}</version>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -196,7 +197,7 @@
     <dependency>
       <groupId>org.jetbrains.kotlin</groupId>
       <artifactId>kotlin-stdlib</artifactId>
-      <version>2.1.10</version>
+      <version>${kotlin.version}</version>
     </dependency>
     <dependency>
       <groupId>com.fasterxml.jackson.module</groupId>
@@ -206,4 +207,4 @@
     </dependency>
   </dependencies>
 
-</project>
+</project>