mypy

gh-141510: Complete What's New in Python 3.15 for frozendict (#145537) #10247

Job	Run time
Run mypy on Tools/jit	19s
Run mypy on Lib/_pyrepl	23s
Run mypy on Tools/clinic	37s
Run mypy on Tools/build	16s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/peg_generator	26s
Run mypy on Tools/cases_generator	19s
Run mypy on Lib/test/libregrtest	21s
	3m 16s

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