mypy

gh-116738: make entering of `contextvars.Context` thread safe (#143074) #18888

Job	Run time
Run mypy on Lib/tomllib	18s
Run mypy on Tools/clinic	21s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/cases_generator	20s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/build	17s
Run mypy on Tools/peg_generator	16s
Run mypy on Tools/jit	17s
	2m 47s

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