mypy

GH-128520: pathlib ABCs: improve protocol for 'openable' objects (#13… #9589

Job	Run time
Run mypy on Tools/clinic	15s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/build	21s
Run mypy on Lib/tomllib	15s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/jit	20s
Run mypy on Lib/_pyrepl	16s
	2m 29s

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