chore(deps): update dependency vitest to v4

Author: renovate[bot]

package.json

@@ -37,7 +37,7 @@
     "svelte": "^4.2.19",
     "svelte-preprocess": "^6.0.0",
     "vite": "^5.0.0",
-    "vitest": "^2.1.9"
+    "vitest": "^4.0.0"
   },
   "dependencies": {
     "svelte-check": "^4.0.0"