bpo-41515: prevent get_type_hints from raising KeyError

[efahl]

https://bugs.python.org/issue41515

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[gvanrossum]

Sorry for sitting on this so long. Can you prepare a short blurb too?

[gvanrossum]

Also please rebase, it might fix the macOS test failure.

[tirkarthi]

I have created #25352 with attribution to author since I don't have permission to update the PR. Thanks.

[gvanrossum]

Closed in favor of GH-25352.