mypy

gh-145056: Add support for merging collections.UserDict and frozendic… #20271

Job	Run time
Run mypy on Tools/jit	17s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Tools/peg_generator	19s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/_pyrepl	16s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/clinic	19s
Run mypy on Tools/build	19s
	2m 43s

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