mypy

gh-120321: Make gi_yieldfrom thread-safe in free-threading build (#14… #19326

Job	Run time
Run mypy on Tools/build	21s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/clinic	20s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/jit	17s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Tools/cases_generator	24s
Run mypy on Lib/tomllib	20s
Run mypy on Tools/peg_generator	19s
	3m 3s

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