mypy

gh-138425: Correctly partially evaluate global generics with undefine… #17649

Job	Run time
Run mypy on Lib/test/libregrtest	22s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/clinic	21s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/jit	18s
Run mypy on Tools/cases_generator	17s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/build	17s
	2m 32s

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