mypy

GH-84850: Remove `urllib.request.URLopener` and `FancyURLopener` (#12… #239

Job	Run time
Run mypy on Lib/_pyrepl	26s
Run mypy on Lib/test/libregrtest	25s
Run mypy on Tools/build	26s
Run mypy on Tools/cases_generator	23s
Run mypy on Tools/clinic	24s
Run mypy on Tools/jit	25s
Run mypy on Tools/peg_generator	25s
Run mypy on Tools/wasm	24s
	3m 18s

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