Why is this workflow even listed in my PR? I deleted it

I’m pretty confused about a workflow that’s listed on my PR:

I deleted the black workflow seven months ago from my project and it looks like it’ll never finish whatever it is it thinks it’s doing. Seems like a bug?

The PR is here: Black upgrade by mlissner · Pull Request #1664 · freelawproject/courtlistener · GitHub

Any ideas what’s going on here or how to fix it?