CI(dependabot): Bump mikepenz/action-junit-report from 3 to 4 (#81)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/run-tox.yml

@@ -50,7 +50,7 @@ jobs:
         pip install tox
         tox run -e min_versions
     - name: JUnit Report Action
-      uses: mikepenz/action-junit-report@v3
+      uses: mikepenz/action-junit-report@v4
       if: always() # always run even if the previous step fails
       with:
         report_paths: 'reports/pytest-*.xml'