build: bump rspec-expectations from 3.8.5 to 3.8.6 in /Library/Homebrew

Bumps [rspec-expectations](https://github.com/rspec/rspec-expectations) from 3.8.5 to 3.8.6.
- [Release notes](https://github.com/rspec/rspec-expectations/releases)
- [Changelog](https://github.com/rspec/rspec-expectations/blob/master/Changelog.md)
- [Commits](https://github.com/rspec/rspec-expectations/compare/v3.8.5...v3.8.6

)

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

Library/Homebrew/Gemfile.lock

@@ -66,7 +66,7 @@ GEM
       rspec-mocks (~> 3.8.0)
     rspec-core (3.8.2)
       rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.5)
+    rspec-expectations (3.8.6)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.8.0)
     rspec-its (1.3.0)