mypy

gh-139588: Docs: fix PDF build (#145480) #19836

Job	Run time
Run mypy on Tools/cases_generator	23s
Run mypy on Tools/clinic	19s
Run mypy on Tools/build	27s
Run mypy on Tools/jit	22s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Lib/tomllib	19s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/peg_generator	24s
	3m 10s

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