mypy

gh-152405: Do not expose the internal mapping when rich-comparing `Ma… #22491

Job	Run time
Run mypy on Lib/tomllib	27s
Run mypy on Tools/check-c-api-docs	31s
Run mypy on Tools/cases_generator	29s
Run mypy on Tools/build	30s
Run mypy on Lib/_pyrepl	35s
Run mypy on Lib/test/libregrtest	32s
Run mypy on Tools/peg_generator	31s
Run mypy on Tools/clinic	34s
Run mypy on Tools/jit	36s
	4m 45s

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