mypy

gh-150880: Normalize paths on Windows before appending wildcard (GH-1… #10745

Job	Run time
Run mypy on Tools/build	31s
Run mypy on Lib/test/libregrtest	33s
Run mypy on Tools/cases_generator	33s
Run mypy on Tools/peg_generator	32s
Run mypy on Lib/tomllib	32s
Run mypy on Lib/_pyrepl	30s
Run mypy on Tools/check-c-api-docs	28s
Run mypy on Tools/clinic	30s
Run mypy on Tools/jit	34s
	4m 43s

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