Bump parallel_tests from 3.7.1 to 3.7.3 (#16754)

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 3.7.1 to 3.7.3.
- [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/v3.7.1...v3.7.3)

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

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

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

Gemfile.lock

@@ -398,7 +398,7 @@ GEM
       mimemagic (~> 0.3.0)
       terrapin (~> 0.6.0)
     parallel (1.21.0)
-    parallel_tests (3.7.1)
+    parallel_tests (3.7.3)
       parallel
     parser (3.0.2.0)
       ast (~> 2.4.1)