mypy

gh-141314: Fix TextIOWrapper.tell() assertion failure with standalone… #17853

Job	Run time
Run mypy on Lib/tomllib	15s
Run mypy on Tools/build	18s
Run mypy on Tools/jit	21s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/clinic	15s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/peg_generator	18s
	2m 28s

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