mypy

gh-71086: Document negative offset support in struct.pack_into() and … #22498

Job	Run time
Run mypy on Tools/clinic	34s
Run mypy on Tools/build	33s
Run mypy on Tools/jit	32s
Run mypy on Lib/_pyrepl	35s
Run mypy on Tools/cases_generator	29s
Run mypy on Lib/test/libregrtest	30s
Run mypy on Lib/tomllib	28s
Run mypy on Tools/peg_generator	29s
Run mypy on Tools/check-c-api-docs	28s
	4m 38s

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