Bump parallel_tests from 4.7.2 to 4.8.0

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 4.7.2 to 4.8.0.
- [Changelog](https://github.com/grosser/parallel_tests/blob/master/CHANGELOG.md)
- [Commits](grosser/parallel_tests@v4.7.2...v4.8.0)

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

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

Gemfile.lock

@@ -55,7 +55,7 @@ GEM
       rubyzip (~> 2)
     palladium (1.1.0)
     parallel (1.26.3)
-    parallel_tests (4.7.2)
+    parallel_tests (4.8.0)
       parallel
     parser (3.3.6.0)
       ast (~> 2.4.1)