Prepare 18.0.0 release. #978

Job	Run time
mypy	22s
ruff	6s
sdist	51s
tox (windows-latest)	1m 57s
tox (ubuntu-latest)	2m 39s
build (ubuntu-latest, 3.8, x64)	3m 34s
build (ubuntu-latest, pypy-3.8, x64)	3m 10s
build (windows-latest, 3.8, x64)	4m 3s
parse_sdl (windows-latest, 2.30.0)	45s
build (windows-latest, 3.8, x86)	4m 34s
build (windows-latest, pypy-3.8, x86)	4m 56s
parse_sdl (windows-latest, 2.0.14)	42s
parse_sdl (windows-latest, 2.0.16)	41s
parse_sdl (macos-latest, 2.0.16)	23s
parse_sdl (macos-latest, 2.0.14)	23s
parse_sdl (macos-latest, 2.30.0)	21s
linux-wheels (x86_64, cp38-manylinux*)	1m 52s
build (windows-latest, pypy-3.8, x64)	5m 10s
test-docs	1m 33s
linux-wheels (aarch64, pp38-manylinux*)	11m 18s
build-macos (cp38-*_universal2)	5m 6s
linux-wheels (x86_64, pp38-manylinux*)	1m 54s
linux-wheels (aarch64, cp38-manylinux*)	12m 23s
build-macos (pp38-*)	3m 46s
publish	37s
	1h 13m 6s

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