Clean up warnings #972

Job	Run time
mypy	22s
ruff	5s
sdist	44s
tox (ubuntu-latest)	1m 46s
tox (windows-latest)	1m 55s
parse_sdl (windows-latest, 2.0.16)	44s
test-docs	2m 1s
parse_sdl (windows-latest, 2.0.14)	45s
parse_sdl (windows-latest, 2.30.0)	35s
parse_sdl (macos-latest, 2.0.14)	25s
parse_sdl (macos-latest, 2.30.0)	22s
parse_sdl (macos-latest, 2.0.16)	22s
build (windows-latest, 3.8, x64)	3m 35s
build (ubuntu-latest, 3.8, x64)	3m 23s
build (windows-latest, pypy-3.8, x64)	5m 18s
build (ubuntu-latest, pypy-3.8, x64)	4m 6s
build (windows-latest, 3.8, x86)	4m 41s
build-macos (pp38-*)	3m 34s
build-macos (cp38-*_universal2)	4m 51s
build (windows-latest, pypy-3.8, x86)	5m 16s
linux-wheels (x86_64, cp38-manylinux*)	2m 2s
linux-wheels (aarch64, cp38-manylinux*)	12m 35s
linux-wheels (aarch64, pp38-manylinux*)	11m 24s
linux-wheels (x86_64, pp38-manylinux*)	2m 13s
publish	0s
	1h 13m 4s

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