mypy

gh-141510: Mention frozendict in dict documentation (#144934) #19562

Job	Run time
Run mypy on Tools/cases_generator	16s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/clinic	21s
Run mypy on Lib/_pyrepl	18s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/build	20s
Run mypy on Tools/jit	19s
Run mypy on Tools/check-c-api-docs	18s
	2m 48s

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