HSEARCH-5312 Upgrade to GSON 2.12.1

Bump com.google.code.gson:gson from 2.11.0 to 2.12.1

Bumps [com.google.code.gson:gson](https://github.com/google/gson) from 2.11.0 to 2.12.1.
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/main/CHANGELOG.md)
- [Commits](google/gson@gson-parent-2.11.0...gson-parent-2.12.1)

---
updated-dependencies:
- dependency-name: com.google.code.gson:gson
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build/parents/build/pom.xml

@@ -81,7 +81,7 @@
         <version.org.opensearch.compatible.main>${version.org.opensearch.latest}</version.org.opensearch.compatible.main>
         <documentation.org.opensearch.url>https://opensearch.org/docs/${parsed-version.org.opensearch.compatible.main.majorVersion}.${parsed-version.org.opensearch.compatible.main.minorVersion}</documentation.org.opensearch.url>
 
-        <version.com.google.code.gson>2.11.0</version.com.google.code.gson>
+        <version.com.google.code.gson>2.12.1</version.com.google.code.gson>
         <version.software.amazon.awssdk>2.30.2</version.software.amazon.awssdk>
         <!-- Jackson: used by the Elasticsearch REST client, by Avro, by the AWS SDK and in tests (wiremock, ...) -->
         <version.com.fasterxml.jackson>2.18.2</version.com.fasterxml.jackson>