Bump parallel_tests from 3.7.3 to 3.8.0

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 3.7.3 to 3.8.0.
- [Release notes](https://github.com/grosser/parallel_tests/releases)
- [Changelog](https://github.com/grosser/parallel_tests/blob/master/CHANGELOG.md)
- [Commits](https://github.com/grosser/parallel_tests/compare/v3.7.3...v3.8.0)

---
updated-dependencies:
- dependency-name: parallel_tests
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -648,8 +648,8 @@ GEM
       webfinger (>= 1.0.1)
     openproject-token (2.2.0)
       activemodel
-    parallel (1.22.0)
-    parallel_tests (3.7.3)
+    parallel (1.22.1)
+    parallel_tests (3.8.0)
       parallel
     parser (3.1.1.0)
       ast (~> 2.4.1)