Bump mypy from 0.761 to 0.800

Bumps mypy from 0.761 to 0.800.

Commits

4c3ea82 Bump version
6f97ae7 Various doc updates, mostly about list[t] etc. (#9936)
40e92a2 Document new source finding behaviour (#9923)
75bb387 Fix type errors stemming from getattr (#9889)
9ceabe0 Add Python 3.9 to trove classifiers (#9887)
331f561 upload-pypi: allow dry running the script with a dev version (#9886)
2c84d7e misc: update wheel building and release scripts (#9570)
a7d4c67 Document PEP 585, 563, 604 and more (#9763)
28f92ac Don't expand global variables in body of a function with constrained type var...
b55bfe0 Allow packages/modules as args with files in cfg (#9834)
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nugget / python-insteonplm

Bump mypy from 0.761 to 0.800 #269