mypy

gh-154775: Don't accept duplicate plus sign when matching complex num… #22814

Job	Run time
Run mypy on Lib/tomllib	20s
Run mypy on Tools/cases_generator	14s
Run mypy on Lib/test/libregrtest	15s
Run mypy on Tools/jit	20s
Run mypy on Tools/build	14s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/check-c-api-docs	14s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/clinic	23s
	2m 40s

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