sorbet/rbi/upstream.rbi: remove old workaround
sorbet/rbi/upstream.rbi: remove old workaround

JCount/brew,MikeMcQuaid/brew,Homebrew/brew,JCount/brew,Homebrew/brew,nandub/brew,nandub/brew,MikeMcQuaid/brew,JCount/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,Homebrew/brew,Homebrew/brew,nandub/brew,JCount/brew,nandub/brew