Update dependency @sveltejs/vite-plugin-svelte to v6

Author: renovate[bot]

bun.lock

@@ -24,7 +24,7 @@
         "@sveltejs/adapter-auto": "^6.0.1",
         "@sveltejs/adapter-cloudflare": "^7.0.3",
         "@sveltejs/kit": "^2.21.2",
-        "@sveltejs/vite-plugin-svelte": "^5.1.0",
+        "@sveltejs/vite-plugin-svelte": "^6.0.0",
         "@tailwindcss/vite": "^4.1.8",
         "@types/chroma-js": "^3.1.1",
         "@types/luxon": "^3.6.2",