mypy

gh-149716: Document PySlot_DATA for Py_mod_gil and Py_mod_multiple_in… #21809

Job	Run time
Run mypy on Tools/build	21s
Run mypy on Tools/jit	24s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/clinic	19s
Run mypy on Lib/_pyrepl	21s
Run mypy on Lib/tomllib	18s
Run mypy on Lib/test/libregrtest	19s
	2m 59s

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