Bump mikepenz/action-junit-report from 3 to 6

Bumps [mikepenz/action-junit-report](https://github.com/mikepenz/action-junit-report) from 3 to 6.
- [Release notes](https://github.com/mikepenz/action-junit-report/releases)
- [Commits](mikepenz/action-junit-report@v3...v6)

---
updated-dependencies:
- dependency-name: mikepenz/action-junit-report
  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/tests.yaml

@@ -103,7 +103,7 @@ jobs:
           retention-days: ${{ env.retention_days }}
       # displays in summary page
       - name: Publish Test Report
-        uses: mikepenz/action-junit-report@v3
+        uses: mikepenz/action-junit-report@v6
         if: always() # always run even if the previous step fails
         with:
           report_paths: 'junit.xml'