Prepare 19.6.3 release. #1357

Job	Run time
ruff	6s
sdist	54s
mypy	29s
parse_sdl (macos-latest, 3.2.16)	27s
parse_sdl (windows-latest, 3.2.16)	42s
pyodide	2m 49s
test-docs	1m 57s
tox (ubuntu-latest)	2m 26s
linux-wheels (aarch64, cp310-manylinux*)	4m 32s
build-macos (cp310-*_universal2)	2m 39s
build-macos (pp310-*)	4m 42s
linux-wheels (aarch64, pp310-manylinux*)	3m 29s
linux-wheels (x86_64, cp310-manylinux*)	4m 12s
linux-wheels (x86_64, pp310-manylinux*)	3m 40s
build (windows-latest, 3.10, x86)	4m 19s
build (ubuntu-latest, 3.10, x64)	3m 33s
build (ubuntu-latest, pypy-3.10, x64)	3m 3s
build (windows-latest, pypy-3.10, x64)	4m 24s
build (windows-latest, 3.10, x64)	3m 45s
publish	43s
	52m 51s

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