mypy

GH-139436: Remove PDF and CHM from IDLE HelpSource (#140418) #18358

Job	Run time
Run mypy on Lib/tomllib	20s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/build	30s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/cases_generator	24s
Run mypy on Tools/jit	21s
Run mypy on Tools/clinic	22s
Run mypy on Lib/_pyrepl	19s
	2m 57s

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