Added new "Restrict pushes that create matching branches: UNCHECKED",
which I discovered is needed during contrib release.
Removed the old `v*` branch protections since we don't need to make any
more patch releases from those old branch names anymore.
This seems nice for after pushing `spotlessApply` on an otherwise
approved and passing PR. I just enabled it and tried it on #6774.
(somewhat related to #6743)
Btw, I thought this was helpful explanation
> After you enable auto-merge for a pull request, if someone who does
not have write permissions to the repository pushes new changes to the
head branch or switches the base branch of the pull request, auto-merge
will be disabled. For example, if a maintainer enables auto-merge for a
pull request from a fork, auto-merge will be disabled after a
contributor pushes new changes to the pull request.
https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/incorporating-changes-from-a-pull-request/automatically-merging-a-pull-request#about-auto-merge
Trask Stalnaker