mypy

gh-146199: Fix error handling in `code_richcompare` when `PyObject_Ri… #20130

Job	Run time
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/build	21s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/peg_generator	18s
Run mypy on Lib/tomllib	19s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/jit	17s
Run mypy on Tools/clinic	17s
Run mypy on Tools/cases_generator	18s
	2m 42s

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