build: bump parallel_tests from 2.30.1 to 2.31.0 in /Library/Homebrew

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 2.30.1 to 2.31.0.
- [Release notes](https://github.com/grosser/parallel_tests/releases)
- [Commits](https://github.com/grosser/parallel_tests/compare/v2.30.1...v2.31.0

)

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

Library/Homebrew/Gemfile.lock

@@ -49,7 +49,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     ntlm-http (0.1.1)
     parallel (1.19.1)
-    parallel_tests (2.30.1)
+    parallel_tests (2.31.0)
       parallel
     parser (2.7.0.2)
       ast (~> 2.4.0)