utils/gems: silence `bundle check` output.
utils/gems: silence `bundle check` output.

EricFromCanada/brew,Homebrew/brew,JCount/brew,claui/brew,claui/brew,sjackman/homebrew,mahori/brew,sjackman/homebrew,JCount/brew,konqui/brew,EricFromCanada/brew,mahori/brew,reitermarkus/brew,nandub/brew,MikeMcQuaid/brew,vitorgalvao/brew,Homebrew/brew,vitorgalvao/brew,reitermarkus/brew,mahori/brew,sjackman/homebrew,claui/brew,sjackman/homebrew,reitermarkus/brew,Homebrew/brew,MikeMcQuaid/brew,nandub/brew,JCount/brew,claui/brew,konqui/brew,MikeMcQuaid/brew,nandub/brew,vitorgalvao/brew,nandub/brew,EricFromCanada/brew,vitorgalvao/brew,JCount/brew,MikeMcQuaid/brew,mahori/brew,konqui/brew,EricFromCanada/brew,konqui/brew,Homebrew/brew,reitermarkus/brew