build(deps): bump concurrent-ruby in /Library/Homebrew

Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.1.8 to 1.1.9.
- [Release notes](https://github.com/ruby-concurrency/concurrent-ruby/releases)
- [Changelog](https://github.com/ruby-concurrency/concurrent-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ruby-concurrency/concurrent-ruby/compare/v1.1.8...v1.1.9)

---
updated-dependencies:
- dependency-name: concurrent-ruby
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Library/Homebrew/Gemfile.lock

@@ -18,7 +18,7 @@ GEM
     colorize (0.8.1)
     commander (4.6.0)
       highline (~> 2.0.0)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.1.9)
     connection_pool (2.2.5)
     diff-lcs (1.4.4)
     docile (1.3.5)