pr-pull: fix PRs conflicting with themselves
pr-pull: fix PRs conflicting with themselves

https://github.com/Homebrew/homebrew-core/pull/106755#issuecomment-1206460655

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