mypy

gh-138122: Fix permission error detection in tachyon's test (#141897) #18114

Job	Run time
Run mypy on Lib/tomllib	20s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/build	18s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/clinic	21s
Run mypy on Tools/jit	18s
	2m 35s

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