mypy

gh-143387: Add news blurb for importlib.metadata highlighting the cha… #21448

Job	Run time
Run mypy on Lib/_pyrepl	24s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/clinic	19s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/jit	20s
Run mypy on Tools/build	16s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Lib/tomllib	16s
	2m 46s

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