mypy

gh-143602: Fix duplicate buffer exports in io.BytesIO.write (#143629) #19131

Job	Run time
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/clinic	20s
Run mypy on Tools/jit	20s
Run mypy on Lib/_pyrepl	17s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/tomllib	16s
Run mypy on Tools/cases_generator	14s
Run mypy on Tools/build	17s
Run mypy on Tools/check-c-api-docs	21s
	2m 45s

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