CI is currently failing on all PRs with the following message from mypy:

stdlib/email/message.pyi:13: error: Cannot determine type of "Any" [has-type].

E.g.:

• Add TODO to support Concatenate in curses #7018
• Add/fix types to a bunch of non-generated protobuf files #7017

mypy appears to be failing on all platforms, but only on Python 3.8+.

I can also reproduce this error locally. No idea what's changed to make it suddenly start erroring as part of the CI checks, though.