Upgrade GitHub Actions to latest versions

[AnnatarHe]

• actions/checkout: v4 → v6
• actions/setup-java: v4 → v5
• gradle/actions/setup-gradle: v4 → v5
• actions/upload-artifact: v4 → v6
• actions/github-script: v7 → v8

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

❌ Your project status has failed because the head coverage (10.60%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

@@           Coverage Diff           @@
##             main       #2   +/-   ##
=======================================
  Coverage   10.60%   10.60%           
=======================================
  Files          19       19           
  Lines         679      679           
  Branches      160      160           
=======================================
  Hits           72       72           
  Misses        593      593           
  Partials       14       14           

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