Use alpha builds of Pyodide supporting SDL3 #1167

Job	Run time
mypy	32s
sdist	2m 25s
ruff	7s
parse_sdl (windows-latest, 3.2.16)	48s
parse_sdl (macos-latest, 3.2.16)	25s
test-docs	3m 10s
build (windows-latest, 3.10, x64)	2m 48s
tox (ubuntu-latest)	4m 35s
build (ubuntu-latest, 3.10, x64)	6m 16s
build-macos (cp310-*_universal2)	2m 6s
build (windows-latest, pypy-3.10, x86)	4m 6s
pyodide	3m 55s
linux-wheels (x86_64, pp310-manylinux*)	3m 22s
build (ubuntu-latest, pypy-3.10, x64)	7m 15s
build-macos (pp310-*)	3m 19s
build (windows-latest, pypy-3.10, x64)	3m 15s
linux-wheels (x86_64, cp310-manylinux*)	3m 50s
build (windows-latest, 3.10, x86)	2m 39s
linux-wheels (aarch64, pp310-manylinux*)	3m 41s
linux-wheels (aarch64, cp310-manylinux*)	4m 28s
publish	-1s
	1h 3m 1s

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