Bump mikepenz/action-junit-report from 3 to 4

Bumps [mikepenz/action-junit-report](https://github.com/mikepenz/action-junit-report) from 3 to 4.
- [Release notes](https://github.com/mikepenz/action-junit-report/releases)
- [Commits](mikepenz/action-junit-report@v3...v4)

---
updated-dependencies:
- dependency-name: mikepenz/action-junit-report
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/tests.yml

@@ -29,7 +29,7 @@ jobs:
         run: |
           tox -e test -- --junitxml=results.xml tests/
       - name: Test report
-        uses: mikepenz/action-junit-report@v3
+        uses: mikepenz/action-junit-report@v4
         if: always()
         with:
           check_name: Test Report (${{ matrix.os }}, ${{ matrix.python }})