mypy

gh-142518: add thread safety docs for set C-APIs (#146562) #10411

Job	Run time
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/build	16s
Run mypy on Lib/tomllib	15s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/jit	18s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/cases_generator	19s
	2m 38s

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