mypy

gh-79315: Add Include/cpython/sliceobject.h header (#139729) #17124

Job	Run time
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/tomllib	22s
Run mypy on Tools/cases_generator	19s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/jit	23s
Run mypy on Tools/build	19s
Run mypy on Tools/clinic	21s
Run mypy on Tools/peg_generator	18s
	2m 40s

Provide feedback