Use alpha builds of Pyodide supporting SDL3. #1165

Job	Run time
mypy	30s
sdist	3m 32s
ruff	6s
parse_sdl (macos-latest, 3.2.16)	26s
parse_sdl (windows-latest, 3.2.16)	46s
test-docs	3m 8s
tox (ubuntu-latest)	3m 53s
build (ubuntu-latest, 3.10, x64)	8m 5s
build (windows-latest, 3.10, x86)	4m 0s
build (ubuntu-latest, pypy-3.10, x64)	5m 35s
build (windows-latest, 3.10, x64)	4m 35s
build (windows-latest, pypy-3.10, x86)	4m 5s
build (windows-latest, pypy-3.10, x64)	4m 58s
linux-wheels (aarch64, pp310-manylinux*)	3m 43s
build-macos (pp310-*)	3m 58s
build-macos (cp310-*_universal2)	2m 33s
pyodide	3m 44s
linux-wheels (x86_64, cp310-manylinux*)	3m 58s
linux-wheels (x86_64, pp310-manylinux*)	3m 27s
linux-wheels (aarch64, cp310-manylinux*)	4m 22s
publish	0s
	1h 9m 24s

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