bpo-34037: Add Python API whatsnew for loop.shutdown_default_executor() by aeros · Pull Request #19634 · python/cpython

I wanted to try merging via the GitHub "Squash and Merge" instead of with automerge this time. I told myself just a minute ago "remember to change it to GH-", and I still completely forgot, haha.

But, I suppose that's somewhat inevitable as a new core dev, seeing as experienced core devs still manage to forget this step on occasion. :-)