ci: update Gradle wrapper validation action

[benny123tw]

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description, Motivation, and Context

Updated the CI job to use gradle/actions/wrapper-validation@v3 instead of the deprecated gradle/wrapper-validation-action@v3.

This change is required because gradle/wrapper-validation-action@v3 has been superseded by gradle/actions/wrapper-validation@v3. Updating ensures we are using the latest supported action.

See https://github.com/gradle/wrapper-validation-action/blob/main/README.md
Also see the warning messages from CI/CD jobs: https://github.com/thriving-dev/java-library-template/actions/runs/9406291395

🧪 How Has This Been Tested?

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[hartmut-co-uk]

Hi @benny123tw, thanks for the contribution!
There's one more change required. It's confusion ... action action action! 😆

[benny123tw]

Hi @hartmut-co-uk, thanks for reviewing this PR.
I've pushed a new commit to fix the issue.

[hartmut-co-uk]

Perfect, thanks!