Prepare 19.6.0 release. #1308

Job	Run time
mypy	25s
ruff	7s
sdist	3m 6s
parse_sdl (macos-latest, 3.2.16)	25s
parse_sdl (windows-latest, 3.2.16)	50s
test-docs	3m 27s
build (ubuntu-latest, pypy-3.10, x64)	4m 47s
tox (ubuntu-latest)	3m 24s
build (ubuntu-latest, 3.10, x64)	7m 20s
build (windows-latest, pypy-3.10, x64)	4m 55s
pyodide	5m 11s
build (windows-latest, 3.10, x64)	4m 8s
build (windows-latest, 3.10, x86)	4m 5s
linux-wheels (x86_64, cp310-manylinux*)	4m 5s
linux-wheels (aarch64, cp310-manylinux*)	3m 59s
linux-wheels (aarch64, pp310-manylinux*)	3m 29s
build-macos (cp310-*_universal2)	2m 28s
build-macos (pp310-*)	3m 41s
linux-wheels (x86_64, pp310-manylinux*)	3m 35s
publish	0s
	1h 3m 27s

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