mypy

gh-129813, PEP 782: Add PyBytesWriter.overallocate (#138941) #9597

Job	Run time
Run mypy on Lib/tomllib	22s
Run mypy on Tools/clinic	19s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/build	21s
Run mypy on Tools/cases_generator	18s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/jit	19s
Run mypy on Tools/peg_generator	20s
	2m 36s

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