CI(dependabot): Bump mikepenz/action-junit-report from 5 to 6

Bumps [mikepenz/action-junit-report](https://github.com/mikepenz/action-junit-report) from 5 to 6.
- [Release notes](https://github.com/mikepenz/action-junit-report/releases)
- [Commits](mikepenz/action-junit-report@v5...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] <[email protected]>

Author: dependabot[bot]

.github/workflows/run-tox.yml

@@ -55,7 +55,7 @@ jobs:
         pip install tox
         tox run -e min_versions
     - name: JUnit Report Action
-      uses: mikepenz/action-junit-report@v5
+      uses: mikepenz/action-junit-report@v6
       if: always() # always run even if the previous step fails
       with:
         report_paths: 'reports/pytest-*.xml'