mypy

gh-145701: Fix `classdict` & `__conditional_annotations__` in cla… #19844

Job	Run time
Run mypy on Tools/cases_generator	15s
Run mypy on Tools/jit	18s
Run mypy on Tools/build	19s
Run mypy on Lib/tomllib	17s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/clinic	22s
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/peg_generator	21s
	2m 50s

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