mypy

gh-149474: use `Py_fopen` in `Binary{Reader,Writer}` for audit hook a… #10538

Job	Run time
Run mypy on Tools/peg_generator	31s
Run mypy on Tools/cases_generator	29s
Run mypy on Tools/clinic	33s
Run mypy on Tools/build	30s
Run mypy on Tools/check-c-api-docs	27s
Run mypy on Lib/tomllib	27s
Run mypy on Lib/_pyrepl	33s
Run mypy on Lib/test/libregrtest	28s
Run mypy on Tools/jit	32s
	4m 30s

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