Bump parallel_tests from 4.0.0 to 4.3.0

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 4.0.0 to 4.3.0.
- [Changelog](https://github.com/grosser/parallel_tests/blob/master/CHANGELOG.md)
- [Commits](grosser/parallel_tests@v4.0.0...v4.3.0)

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

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

Gemfile.lock

@@ -23,8 +23,8 @@ GEM
     json (2.6.3)
     moneta (1.0.0)
     multi_json (1.15.0)
-    parallel (1.22.1)
-    parallel_tests (4.0.0)
+    parallel (1.23.0)
+    parallel_tests (4.3.0)
       parallel
     platform-api (3.5.0)
       heroics (~> 0.1.1)