Update dependency vitest to v4

Author: renovate[bot]

package.json

@@ -13,7 +13,7 @@
     "jsdom": "^25.0.0",
     "typescript": "^5.4.5",
     "vite-tsconfig-paths": "^5.0.0",
-    "vitest": "^2.0.0"
+    "vitest": "^4.0.0"
   },
   "scripts": {
     "exercise": "tt-cli run",