mypy

gh-140748: socket_helper.transient_internet: Unwrap UrlError.__cause_… #17591

Job	Run time
Run mypy on Lib/_pyrepl	18s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/build	20s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/clinic	17s
Run mypy on Tools/jit	27s
	2m 38s

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