mypy

gh-141659: Fix bad file descriptor error in subprocess on AIX (GH-141… #18038

Job	Run time
Run mypy on Lib/tomllib	18s
Run mypy on Tools/clinic	19s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/jit	18s
Run mypy on Tools/cases_generator	17s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/build	18s
	2m 27s

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