style: remove HOMEBREW_RUBY_WARNINGS
style: remove HOMEBREW_RUBY_WARNINGS

This is hiding legitimate errors which can cause CI failures.

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