astropy core lib: Auto delete branch after merge?

[Pey Lian Lim]

https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/managing-the-automatic-deletion-of-branches

Can I enable this for astropy core lib repo? Why not? Thanks!

Motivation: pre-commit and some other automated workflows open PRs from astropy repo (not fork). Would be nice if those branches are auto-deleted on merge.

ref: https://github.com/astropy/astropy/pull/20188#issuecomment-5170941228