mypy

gh-151126: Fix missing `PyErr_NoMemory()` in `remove_unused_consts` (… #21782

Job	Run time
Run mypy on Tools/jit	19s
Run mypy on Tools/clinic	19s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/cases_generator	17s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/build	18s
Run mypy on Tools/peg_generator	20s
Run mypy on Lib/test/libregrtest	22s
	2m 50s

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