mypy

GH-123299: Copyedit 3.14 What's New: Removed (#137794) #16179

Job	Run time
Run mypy on Lib/test/libregrtest	16s
Run mypy on Lib/_pyrepl	15s
Run mypy on Tools/jit	20s
Run mypy on Tools/build	16s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/clinic	17s
	2m 19s

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