Update gradle jar to newer version (java micronut)

[wing328]

update gradle jar to newer version

https://github.com/OpenAPITools/openapi-generator/actions/runs/16978872347/job/48134408588?pr=21756

Gradle User Home already exists at /home/runner/.gradle
Gradle User Home already exists: will not restore from cache.
Merged default JDK locations into /home/runner/.m2/toolchains.xml
Fetched 1 of 1 checksums
✗ Found unknown Gradle Wrapper JAR files:
  e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 modules/openapi-generator/src/main/resources/java-micronaut/common/configuration/gradlew/gradle-wrapper.jar
  e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 samples/client/petstore/java-micronaut-client/gradle/wrapper/gradle-wrapper.jar
  e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 samples/server/petstore/java-micronaut-server/gradle/wrapper/gradle-wrapper.jar
✓ Found known Gradle Wrapper JAR files:
  c5a643cf80162e665cc228f7b16f343fef868e47d3a4836f62e18b7e17ac018a modules/openapi-generator-gradle-plugin/gradle/wrapper/gradle-wrapper.jar
  28b330c20a9a73881dfe9702df78d4d78bf72368e8906c70080ab6932462fe9e modules/openapi-generator-gradle-plugin/samples/local-spec/gradle/wrapper/gradle-wrapper.jar
  e996d452d2645e70c01c11143ca2d3742734a28da2bf61f25c82bdc288c9e637 modules/openapi-generator/src/main/resources/android/gradle-wrapper.jar

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  ./mvnw clean package || exit
  ./bin/generate-samples.sh ./bin/configs/*.yaml || exit
  ./bin/utils/export_docs_generators.sh || exit
  

  (For Windows users, please run the script in WSL)
  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
  IMPORTANT: Do NOT purge/delete any folders/files (e.g. tests) when regenerating the samples as manually written tests may be removed.
• File the PR against the correct branch: master (upcoming 7.x.0 minor release - breaking changes with fallbacks), 8.0.x (breaking changes without fallbacks)
• If your PR solves a reported issue, reference it using GitHub's linking syntax (e.g., having "fixes #123" present in the PR description)
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

cc @bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04) @lwlee2608 (2019/10) @martin-mfg (2023/08)