add ACAO: * to static assets in dev

[Rich-Harris]

closes #7664. we might just want to wait for #7543 instead depending on ETA (@benmccann?)

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[benmccann]

@bluwy would probably have a better idea about Vite 4 ETA, but I'm guessing it's a few weeks away

[dummdidumm]

A few weeks is probably a few too long, given that the fix is so small, so if it fixes that in the meantime, we should merge it