fix: backport #18367,augment hash for CSS files to prevent chromium erroring by loading previous files

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Description

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/ecosystem-ci run

[vite-ecosystem-ci]

📝 Ran ecosystem CI on 583b446: Open

suite	result	latest scheduled
astro	✅ success	❌ failure
remix	✅ success	❌ failure
sveltekit	❌ failure	❌ failure
vike	✅ success	❌ failure
vite-environment-examples	✅ success	❌ failure
vite-plugin-svelte	❌ failure	❌ failure
vitest	✅ success	❌ failure

✅ analogjs, histoire, ladle, laravel, marko, nuxt, previewjs, quasar, qwik, rakkas, redwoodjs, storybook, unocss, vite-plugin-pwa, vite-plugin-react, vite-plugin-react-swc, vite-plugin-vue, vite-setup-catalogue, vitepress, vuepress

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@dominikg @bluwy @Rich-Harris @benmccann
SvelteKit and vite-plugin-svelte is failing probably because of svelte v4 -> v5 change.
I guess this PR won't break anything, but I'll postpone cutting the patch for a day or so if you prefer to look into the fail.

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vite-plugin-svelte passed (https://github.com/vitejs/vite-ecosystem-ci/actions/runs/11458010458/job/31879504816). Going to cut the patch tomorrow morning (~16 hours later).

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Released v5.4.10