Bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci-actions.yml

@@ -59,7 +59,7 @@ jobs:
       shell: bash
       run: find . -name '*-reports' -type d | tar -czf test-reports.tgz -T -
     - name: Upload failure Archive (if maven failed)
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       if: failure()
       with:
         name: test-reports-jdk${{matrix.java.name}}