mypy

GH-146096: Fix segfault in BaseExceptionGroup repr (#146141) #10301

Job	Run time
Run mypy on Tools/peg_generator	16s
Run mypy on Tools/clinic	1m 21s
Run mypy on Lib/_pyrepl	22s
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Lib/tomllib	19s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/build	17s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/jit	23s
	3m 57s

Provide feedback