mypy

gh-143602: Fix duplicate buffer exports in io.BytesIO.write (#143629) #10071

Job	Run time
Run mypy on Lib/_pyrepl	15s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Lib/test/libregrtest	23s
Run mypy on Tools/cases_generator	20s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/build	13s
Run mypy on Tools/jit	27s
Run mypy on Tools/clinic	18s
Run mypy on Lib/tomllib	17s
	2m 54s

Provide feedback