mypy

gh-141594: A free-threaded JIT #17980

Job	Run time
Run mypy on Tools/build	17s
Run mypy on Lib/_pyrepl	16s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/clinic	21s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/jit	20s
Run mypy on Lib/tomllib	20s
Run mypy on Tools/peg_generator	21s
	2m 32s

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