Prepare 19.3.0 release. #1248

Job	Run time
ruff	6s
sdist	3m 11s
mypy	30s
parse_sdl (windows-latest, 3.2.16)	31s
parse_sdl (macos-latest, 3.2.16)	29s
pyodide	5m 3s
tox (ubuntu-latest)	3m 39s
linux-wheels (x86_64, cp310-manylinux*)	4m 7s
linux-wheels (aarch64, cp310-manylinux*)	4m 8s
linux-wheels (aarch64, pp310-manylinux*)	3m 31s
build (ubuntu-latest, 3.10, x64)	6m 9s
linux-wheels (x86_64, pp310-manylinux*)	3m 31s
build (windows-latest, 3.10, x86)	2m 58s
build (windows-latest, 3.10, x64)	2m 41s
build (windows-latest, pypy-3.10, x86)	3m 44s
build (windows-latest, pypy-3.10, x64)	3m 24s
build (ubuntu-latest, pypy-3.10, x64)	5m 25s
build-macos (cp310-*_universal2)	2m 33s
build-macos (pp310-*)	3m 52s
test-docs	4m 11s
publish	0s
	1h 3m 43s

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