Bump parallel_tests from 4.2.1 to 4.2.2

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 4.2.1 to 4.2.2.
- [Changelog](https://github.com/grosser/parallel_tests/blob/master/CHANGELOG.md)
- [Commits](grosser/parallel_tests@v4.2.1...v4.2.2)

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

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

Gemfile.lock

@@ -52,7 +52,7 @@ GEM
     mini_mime (1.1.5)
     multi_test (1.1.0)
     parallel (1.23.0)
-    parallel_tests (4.2.1)
+    parallel_tests (4.2.2)
       parallel
     parser (3.2.2.3)
       ast (~> 2.4.1)