Prepare 19.6.1 release. #1334

Job	Run time
ruff	7s
sdist	1m 8s
mypy	23s
parse_sdl (macos-latest, 3.2.16)	28s
parse_sdl (windows-latest, 3.2.16)	47s
tox (ubuntu-latest)	3m 15s
build-macos (cp310-*_universal2)	2m 29s
test-docs	1m 56s
pyodide	2m 48s
build-macos (pp310-*)	3m 38s
linux-wheels (x86_64, cp310-manylinux*)	4m 4s
build (windows-latest, 3.10, x86)	5m 43s
build (windows-latest, 3.10, x64)	2m 42s
build (ubuntu-latest, pypy-3.10, x64)	2m 47s
build (ubuntu-latest, 3.10, x64)	3m 53s
linux-wheels (aarch64, pp310-manylinux*)	3m 49s
linux-wheels (aarch64, cp310-manylinux*)	4m 11s
build (windows-latest, pypy-3.10, x64)	4m 12s
linux-wheels (x86_64, pp310-manylinux*)	3m 24s
publish	0s
	51m 44s

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