mypy

gh-141415: Remove unused variables and comment in `_pyrepl.windows_co… #17841

Job	Run time
Run mypy on Lib/tomllib	20s
Run mypy on Lib/_pyrepl	16s
Run mypy on Lib/test/libregrtest	17s
Run mypy on Tools/build	20s
Run mypy on Tools/clinic	17s
Run mypy on Tools/jit	22s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/cases_generator	15s
	2m 24s

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