deps: update dependency com.google.cloud:google-cloud-dns to v2.1.8 (#5428)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-dns](https://togithub.com/googleapis/java-dns) | `2.1.7` -> `2.1.8` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dns/2.1.8/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dns/2.1.8/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dns/2.1.8/compatibility-slim/2.1.7)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dns/2.1.8/confidence-slim/2.1.7)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-dns</summary>

### [`v2.1.8`](https://togithub.com/googleapis/java-dns/blob/HEAD/CHANGELOG.md#&#8203;218-httpsgithubcomgoogleapisjava-dnscomparev217v218-2022-10-06)

[Compare Source](https://togithub.com/googleapis/java-dns/compare/v2.1.7...v2.1.8)

##### Dependencies

-   Update dependency charset-normalizer to v2.1.1 ([#&#8203;719](https://togithub.com/googleapis/java-dns/issues/719)) ([3ed0f81](https://togithub.com/googleapis/java-dns/commit/3ed0f812b58d25faff36fdeb30ba5b17d71b55e2))
-   Update dependency com.google.apis:google-api-services-dns to v1-rev20220915-2.0.0 ([#&#8203;713](https://togithub.com/googleapis/java-dns/issues/713)) ([b20712c](https://togithub.com/googleapis/java-dns/commit/b20712c4f7eece2da18137570ef90cb68ae3d152))
-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.0.4 ([#&#8203;737](https://togithub.com/googleapis/java-dns/issues/737)) ([ad22c03](https://togithub.com/googleapis/java-dns/commit/ad22c030392f5fe36aa84a41e9c8f935da86ed67))
-   Update dependency google-api-core to v2.10.1 ([#&#8203;720](https://togithub.com/googleapis/java-dns/issues/720)) ([3d25321](https://togithub.com/googleapis/java-dns/commit/3d25321ef52ba5330137086ad72f46ef3f25e58d))
-   Update dependency google-cloud-core to v2.3.2 ([#&#8203;718](https://togithub.com/googleapis/java-dns/issues/718)) ([9f77891](https://togithub.com/googleapis/java-dns/commit/9f778916b7fa5990d91bfb9983bda75d0c8ef03e))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -408,7 +408,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-dns</artifactId>
-        <version>2.1.7</version>
+        <version>2.1.8</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>