Prepare 18.0.0 release. #979

Job	Run time
ruff	6s
sdist	40s
mypy	23s
tox (windows-latest)	1m 58s
tox (ubuntu-latest)	1m 45s
test-docs	1m 36s
build (ubuntu-latest, 3.8, x64)	3m 14s
build (windows-latest, 3.8, x64)	4m 2s
build (ubuntu-latest, pypy-3.8, x64)	3m 10s
build (windows-latest, pypy-3.8, x86)	5m 44s
build (windows-latest, 3.8, x86)	3m 42s
build (windows-latest, pypy-3.8, x64)	5m 15s
parse_sdl (windows-latest, 2.0.16)	40s
parse_sdl (windows-latest, 2.30.0)	41s
parse_sdl (macos-latest, 2.0.14)	20s
parse_sdl (macos-latest, 2.0.16)	23s
build-macos (cp38-*_universal2)	5m 15s
linux-wheels (x86_64, cp38-manylinux*)	1m 59s
parse_sdl (windows-latest, 2.0.14)	43s
linux-wheels (x86_64, pp38-manylinux*)	1m 58s
build-macos (pp38-*)	3m 45s
parse_sdl (macos-latest, 2.30.0)	21s
linux-wheels (aarch64, pp38-manylinux*)	11m 37s
linux-wheels (aarch64, cp38-manylinux*)	12m 40s
publish	0s
	1h 11m 57s

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