mypy

gh-140916: Remove unused codes in winreg.c (#140934) #17715

Job	Run time
Run mypy on Lib/test/libregrtest	22s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/peg_generator	21s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/clinic	18s
Run mypy on Tools/jit	18s
Run mypy on Tools/cases_generator	21s
Run mypy on Tools/build	21s
	2m 37s

Provide feedback