chore(deps): update devdependency vitest to v4

Author: renovate[bot]

package.json

@@ -107,7 +107,7 @@
     "tsup": "^8.5.0",
     "tsx": "^4.20.6",
     "typescript": "^5.9.3",
-    "vitest": "^3.2.4"
+    "vitest": "^4.0.5"
   },
   "peerDependencies": {
     "prettier": ">=3.0.0"