Prepare 16.2.3 release. #918

Job	Run time
mypy	22s
ruff	5s
sdist	35s
tox (ubuntu-latest)	1m 23s
tox (windows-latest)	2m 33s
test-docs	1m 23s
build-macos (cp38-*_universal2)	4m 37s
build (ubuntu-latest, 3.8, x64)	2m 43s
build-macos (cp38-*_x86_64)	3m 39s
linux-wheels (x86_64, cp38-manylinux*)	1m 54s
build (ubuntu-latest, pypy-3.8, x64)	2m 57s
build-macos (pp38-*)	4m 6s
linux-wheels (x86_64, pp38-manylinux*)	1m 55s
build (windows-latest, 3.8, x64)	3m 46s
linux-wheels (aarch64, cp38-manylinux*)	10m 35s
build (windows-latest, pypy-3.8, x64)	4m 18s
linux-wheels (aarch64, pp38-manylinux*)	9m 31s
build (windows-latest, 3.8, x86)	3m 44s
parse_sdl (windows-latest, 2.0.14)	57s
build (windows-latest, pypy-3.8, x86)	3m 59s
parse_sdl (windows-latest, 2.0.16)	35s
parse_sdl (macos-latest, 2.0.14)	20s
parse_sdl (macos-latest, 2.0.16)	24s
publish	0s
	1h 6m 21s

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