mypy

gh-141865: Fix translation of strings in `changes.py` extension (#141… #18104

Job	Run time
Run mypy on Lib/tomllib	18s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/jit	21s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/clinic	19s
Run mypy on Tools/build	22s
	2m 32s

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