mypy

Doc: remove the invalid type variables of typing.TextIO and BinaryIO … #18478

Job	Run time
Run mypy on Tools/jit	22s
Run mypy on Tools/build	18s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Lib/tomllib	21s
Run mypy on Tools/cases_generator	25s
Run mypy on Tools/clinic	20s
	2m 44s

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