chore(deps): update @cloudflare/vitest-pool-workers

Author: c-c-epr

package.json

@@ -20,7 +20,7 @@
     "postinstall": "wrangler types"
   },
   "devDependencies": {
-    "@cloudflare/vitest-pool-workers": "^0.16.20",
+    "@cloudflare/vitest-pool-workers": "^0.18.4",
     "@types/node": "^26.1.1",
     "prettier": "^3.9.5",
     "typescript": "^7.0.2",