build(deps): bump parallel_tests in /Library/Homebrew

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 3.6.0 to 3.7.0.
- [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/v3.6.0...v3.7.0

)

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

Library/Homebrew/Gemfile.lock

@@ -58,7 +58,7 @@ GEM
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
     parallel (1.20.1)
-    parallel_tests (3.6.0)
+    parallel_tests (3.7.0)
       parallel
     parlour (6.0.0)
       commander (~> 4.5)