Update Vite and vite-plugin-svelte (proper fix for hydration issue?)

[arcataroger]

Well... this is embarrassing. This was the much simpler (and probably more "correct") fix for datocms/datocms-svelte#14 (the svelte:head hydration issue).

We just needed to upgrade vite and vite-plugin-svelte to the next major versions, which is what the official Svelte demo uses.

What we had:

  "@sveltejs/vite-plugin-svelte": "^4.0.0",
  "vite": "^5.4.4"

What the official demo has:

"devDependencies": {
  "@sveltejs/vite-plugin-svelte": "^5.0.0",
  "vite": "^6.0.0"
}

(from https://github.com/sveltejs/cli/blob/main/packages/create/templates/minimal/package.template.json)

Upgrading those (after deleting the lockfile and regenerating it) fixed the hydration issue, even with [email protected]. So I guess that PR was unnecessary and the if-then inside the head worked fine as it was =(

Sorry about that. I spent a bit trying to create a minimal example for Svelte but couldn't, then started to investigate package versions. I didn't look into this previously because I thought whoever upgraded that starter to Svelte 5 probably did the same for the other libs... apparently not yet lol.

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