mypy

gh-89520: Load extension settings and keybindings from user config (G… #20640

Job	Run time
Run mypy on Lib/tomllib	16s
Run mypy on Tools/build	20s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/check-c-api-docs	15s
Run mypy on Tools/clinic	18s
Run mypy on Tools/jit	19s
Run mypy on Tools/peg_generator	18s
	2m 39s

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