mypy

gh-141594: A free-threaded JIT #17978

Job	Run time
Run mypy on Tools/clinic	20s
Run mypy on Lib/_pyrepl	18s
Run mypy on Lib/tomllib	20s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/build	18s
Run mypy on Tools/jit	20s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/cases_generator	17s
	2m 35s

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