mypy

gh-151945: Fix all reference warnings and various solecisms in the `h… #10750

Job	Run time
Run mypy on Lib/_pyrepl	31s
Run mypy on Tools/cases_generator	33s
Run mypy on Tools/jit	30s
Run mypy on Tools/peg_generator	32s
Run mypy on Tools/clinic	31s
Run mypy on Tools/check-c-api-docs	25s
Run mypy on Lib/tomllib	28s
Run mypy on Tools/build	28s
Run mypy on Lib/test/libregrtest	32s
	4m 30s

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