mypy

gh-62480: De-personalize "Mocking Unbound Methods" section in `unitte… #17803

Job	Run time
Run mypy on Tools/build	17s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/jit	18s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/clinic	19s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/peg_generator	18s
	2m 29s

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