mypy

gh-141645: Refactor tachyon's live TUI tests to not use private field… #18075

Job	Run time
Run mypy on Lib/_pyrepl	21s
Run mypy on Lib/tomllib	18s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/build	20s
Run mypy on Tools/cases_generator	22s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/jit	17s
	2m 31s

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