chore: update vite and related packages

[hyunbinseo]

vitest@3 has been released. vite@6 can be used.

• [email protected]: Support Vite 6

Previous attempts:

• feat: update templates to vite@6 #340
• fix: use vite@5 #353 (reverts above PR)

Additional changes:

• Vitest add-on has been update to ^3.0.0.

┌  Welcome to the Svelte CLI! (v0.6.13)
│
◇  Where would you like your project to be created?
│  ./
│
◇  Which template would you like?
│  SvelteKit minimal
│
◇  Add type checking with Typescript?
│  Yes, using Typescript syntax
│
◆  Project created
│
◇  What would you like to add to your project? (use arrow keys / space bar)
│  vitest

pnpm add @sveltejs/vite-plugin-svelte@latest vite@latest vitest@latest
pnpm test # works
pnpm test:unit # works

[changeset-bot]

🦋 Changeset detected

Latest commit: ebff8ef

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
sv	Patch

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[pkg-pr-new]

Open in Stackblitz

npm i https://pkg.pr.new/sveltejs/cli/sv@410

npm i https://pkg.pr.new/sveltejs/cli/svelte-migrate@410

commit: ebff8ef

[hyunbinseo]

This was missed in the previous PR and is applied here.

• chore: major bump adapter auto, cloudflare #401