mypy

Link listsort.txt in InternalDocs/README.md (#142619) #18462

Job	Run time
Run mypy on Lib/tomllib	14s
Run mypy on Tools/clinic	18s
Run mypy on Lib/_pyrepl	20s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/jit	18s
Run mypy on Tools/build	20s
Run mypy on Tools/peg_generator	19s
	2m 28s

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