chore(deps): update dependency vitest to v4

Author: renovate[bot]

package.json

@@ -94,7 +94,7 @@
     "smee-client": "2.0.2",
     "strip-ansi": "7.1.0",
     "typescript": "5.5.4",
-    "vitest": "3.0.9",
+    "vitest": "4.0.18",
     "wrangler": "4.2.0"
   },
   "sideEffects": false,