chore(deps): update dependency vitest to v4

Author: renovate[bot]

package.json

@@ -67,7 +67,7 @@
     "jsdom": "^27.0.0",
     "rimraf": "^6.0.1",
     "svelte": "^5.0.0",
-    "vitest": "^3.2.4"
+    "vitest": "^4.0.0"
   },
   "peerDependencies": {
     "@interactive-video-labs/core": "^0.1.2 || ^0.2.0"