Support and test mypy 0.910, 0.920, and 0.921 #3572
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Change Summary
Problem: We aren't testing mypy version compatibility, which makes it hard to know when we're making/breaking compatibility. In my local testing, it seems that we've recently broken mypy 0.910 compatibility.
Solution: Add mypy version matrix to CI and fix compatibility regressions.
Related issue number
Link: #3538 (comment)
See-also: #3175
Checklist
changes/<pull request or issue id>-<github username>.md
file added describing change(see changes/README.md for details)