Prepare 19.6.3 release. #1358

Job	Run time
sdist	1m 37s
ruff	7s
mypy	29s
parse_sdl (macos-latest, 3.2.16)	27s
parse_sdl (windows-latest, 3.2.16)	1m 38s
build-macos (cp310-*_universal2)	2m 48s
tox (ubuntu-latest)	2m 16s
build-macos (pp310-*)	5m 16s
test-docs	2m 1s
pyodide	2m 55s
linux-wheels (aarch64, pp310-manylinux*)	3m 42s
linux-wheels (x86_64, cp310-manylinux*)	3m 55s
build (ubuntu-latest, 3.10, x64)	4m 9s
build (windows-latest, 3.10, x64)	3m 1s
build (windows-latest, pypy-3.10, x64)	3m 49s
build (windows-latest, 3.10, x86)	3m 58s
linux-wheels (aarch64, cp310-manylinux*)	4m 13s
build (ubuntu-latest, pypy-3.10, x64)	3m 2s
linux-wheels (x86_64, pp310-manylinux*)	3m 36s
publish	0s
	52m 59s

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