mypy

gh-142518: add thread safety docs on bytes C-API (#146415) #20209

Job	Run time
Run mypy on Tools/build	18s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/jit	18s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/tomllib	16s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/clinic	19s
	2m 42s

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