mypy

gh-148653: Fix some marshal errors related to recursive immutable obj… #20776

Job	Run time
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/build	18s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Lib/tomllib	14s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Tools/jit	19s
Run mypy on Lib/_pyrepl	16s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/clinic	15s
	2m 32s

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