Bump parallel_tests from 3.0.0 to 3.1.0 (#14406)

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 3.0.0 to 3.1.0.
- [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/v3.0.0...v3.1.0)

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

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

Gemfile.lock

@@ -406,7 +406,7 @@ GEM
       av (~> 0.9.0)
       paperclip (>= 2.5.2)
     parallel (1.19.2)
-    parallel_tests (3.0.0)
+    parallel_tests (3.1.0)
       parallel
     parser (2.7.1.4)
       ast (~> 2.4.1)
@@ -744,7 +744,7 @@ DEPENDENCIES
   paperclip (~> 6.0)
   paperclip-av-transcoder (~> 0.6)
   parallel (~> 1.19)
-  parallel_tests (~> 3.0)
+  parallel_tests (~> 3.1)
   parslet
   pg (~> 1.2)
   pghero (~> 2.6)