Prepare 19.3.0 release. #1247

Job	Run time
ruff	9s
sdist	2m 49s
mypy	29s
parse_sdl (windows-latest, 3.2.16)	40s
parse_sdl (macos-latest, 3.2.16)	23s
test-docs	3m 39s
tox (ubuntu-latest)	4m 33s
build (ubuntu-latest, pypy-3.10, x64)	5m 40s
build (ubuntu-latest, 3.10, x64)	5m 28s
build (windows-latest, 3.10, x64)	3m 8s
build (windows-latest, pypy-3.10, x86)	3m 41s
build (windows-latest, 3.10, x86)	2m 51s
build (windows-latest, pypy-3.10, x64)	4m 28s
pyodide	4m 42s
build-macos (pp310-*)	3m 22s
linux-wheels (x86_64, pp310-manylinux*)	3m 32s
linux-wheels (aarch64, pp310-manylinux*)	3m 34s
build-macos (cp310-*_universal2)	1m 52s
linux-wheels (x86_64, cp310-manylinux*)	4m 1s
linux-wheels (aarch64, cp310-manylinux*)	3m 55s
publish	46s
	1h 3m 42s

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