mypy

gh-141510: Support `frozendict` in `plistlib` (#145590) #20288

Job	Run time
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/peg_generator	16s
Run mypy on Tools/build	20s
Run mypy on Tools/cases_generator	17s
Run mypy on Lib/tomllib	18s
Run mypy on Lib/_pyrepl	16s
Run mypy on Tools/jit	22s
Run mypy on Tools/clinic	16s
Run mypy on Tools/check-c-api-docs	20s
	2m 43s

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