Prepare 18.0.0 release. #980

Job	Run time
ruff	7s
mypy	22s
sdist	41s
tox (ubuntu-latest)	1m 40s
tox (windows-latest)	2m 48s
build (windows-latest, 3.8, x64)	3m 42s
build (ubuntu-latest, pypy-3.8, x64)	3m 8s
parse_sdl (windows-latest, 2.0.16)	36s
parse_sdl (macos-latest, 2.30.0)	21s
test-docs	1m 42s
linux-wheels (x86_64, pp38-manylinux*)	2m 1s
parse_sdl (windows-latest, 2.0.14)	32s
build-macos (cp38-*_universal2)	5m 9s
build-macos (pp38-*)	3m 40s
parse_sdl (macos-latest, 2.0.16)	22s
linux-wheels (x86_64, cp38-manylinux*)	1m 58s
build (windows-latest, 3.8, x86)	4m 41s
build (ubuntu-latest, 3.8, x64)	3m 19s
build (windows-latest, pypy-3.8, x86)	5m 16s
linux-wheels (aarch64, pp38-manylinux*)	11m 16s
parse_sdl (macos-latest, 2.0.14)	24s
linux-wheels (aarch64, cp38-manylinux*)	12m 16s
parse_sdl (windows-latest, 2.30.0)	34s
build (windows-latest, pypy-3.8, x64)	4m 31s
publish	0s
	1h 11m 6s

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