mypy

gh-139551: add support for BaseExceptionGroup in IDLE (GH-139563) #10419

Job	Run time
Run mypy on Lib/tomllib	15s
Run mypy on Tools/build	19s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/peg_generator	19s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/clinic	14s
Run mypy on Tools/jit	18s
Run mypy on Tools/check-c-api-docs	14s
Run mypy on Tools/cases_generator	17s
	2m 31s

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