Clean up warnings #973

Job	Run time
ruff	9s
sdist	35s
mypy	25s
tox (ubuntu-latest)	1m 55s
tox (windows-latest)	2m 31s
test-docs	1m 45s
build (ubuntu-latest, 3.8, x64)	3m 21s
build (ubuntu-latest, pypy-3.8, x64)	3m 5s
build (windows-latest, pypy-3.8, x86)	5m 5s
parse_sdl (windows-latest, 2.0.14)	34s
parse_sdl (windows-latest, 2.30.0)	45s
parse_sdl (windows-latest, 2.0.16)	35s
build (windows-latest, 3.8, x86)	4m 16s
build (windows-latest, 3.8, x64)	4m 21s
parse_sdl (macos-latest, 2.0.14)	24s
linux-wheels (aarch64, pp38-manylinux*)	11m 19s
linux-wheels (aarch64, cp38-manylinux*)	12m 34s
build-macos (cp38-*_universal2)	4m 50s
parse_sdl (macos-latest, 2.30.0)	20s
build-macos (pp38-*)	3m 45s
parse_sdl (macos-latest, 2.0.16)	20s
linux-wheels (x86_64, cp38-manylinux*)	1m 58s
linux-wheels (x86_64, pp38-manylinux*)	2m 0s
build (windows-latest, pypy-3.8, x64)	4m 52s
publish	-1s
	1h 11m 43s

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