mypy

gh-151942: Fix all Sphinx nitpicks in the Python 2.4 What's New (#153… #22435

Job	Run time
Run mypy on Lib/test/libregrtest	33s
Run mypy on Tools/build	34s
Run mypy on Tools/clinic	33s
Run mypy on Tools/check-c-api-docs	29s
Run mypy on Tools/peg_generator	33s
Run mypy on Lib/_pyrepl	28s
Run mypy on Tools/jit	34s
Run mypy on Tools/cases_generator	29s
Run mypy on Lib/tomllib	31s
	4m 44s

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