os/mac/diagnostic: suggest untapping phinze/cask.
os/mac/diagnostic: suggest untapping phinze/cask.

As seen in https://github.com/Homebrew/brew/issues/7605.

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