mypy

gh-146011: Fix use-after-free in `signaldict_repr` after deletion (#1… #22757

Job	Run time
Run mypy on Lib/tomllib	32s
Run mypy on Tools/cases_generator	29s
Run mypy on Lib/test/libregrtest	33s
Run mypy on Tools/jit	34s
Run mypy on Lib/_pyrepl	31s
Run mypy on Tools/peg_generator	30s
Run mypy on Tools/check-c-api-docs	31s
Run mypy on Tools/build	34s
Run mypy on Tools/clinic	35s
	4m 49s

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