Bump actions/upload-artifact in /.github/actions/maven/experiment-1 (#903)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/actions/maven/experiment-1/action.yml

@@ -120,7 +120,7 @@ runs:
       shell: bash
     - name: Archive receipt
       id: upload-artifact
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       if: always()
       with:
         name: experiment-1-receipt-${{ github.job }}${{ strategy.job-total > 1 && format('-{0}', strategy.job-index) || '' }}