mypy

gh-149044: Implement PEP 820 – PySlot: Unified slot system for the C … #21144

Job	Run time
Run mypy on Tools/check-c-api-docs	13s
Run mypy on Tools/peg_generator	22s
Run mypy on Tools/build	19s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/jit	17s
Run mypy on Tools/clinic	19s
Run mypy on Lib/test/libregrtest	14s
Run mypy on Tools/cases_generator	12s
Run mypy on Lib/tomllib	17s
	2m 30s

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