Bump concurrent-ruby from 1.1.4 to 1.1.5 in /docs
Bump concurrent-ruby from 1.1.4 to 1.1.5 in /docs

Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.1.4 to 1.1.5.
- [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/v1.1.4...v1.1.5)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
konqui/brew,Homebrew/brew,MikeMcQuaid/brew,JCount/brew,nandub/brew,sjackman/homebrew,vitorgalvao/brew,claui/brew,EricFromCanada/brew,EricFromCanada/brew,nandub/brew,claui/brew,mahori/brew,vitorgalvao/brew,MikeMcQuaid/brew,mahori/brew,JCount/brew,MikeMcQuaid/brew,sjackman/homebrew,claui/brew,JCount/brew,MikeMcQuaid/brew,Homebrew/brew,Homebrew/brew,EricFromCanada/brew,claui/brew,JCount/brew,reitermarkus/brew,reitermarkus/brew,EricFromCanada/brew,mahori/brew,nandub/brew,sjackman/homebrew,Homebrew/brew,vitorgalvao/brew,vitorgalvao/brew,nandub/brew,reitermarkus/brew,mahori/brew,konqui/brew,konqui/brew,sjackman/homebrew,konqui/brew,reitermarkus/brew