chore(deps): update dependency @ai-sdk/gateway to v4

Author: renovate[bot]

package.json

@@ -13,7 +13,7 @@
     "db:migrate": "nuxt db migrate"
   },
   "dependencies": {
-    "@ai-sdk/gateway": "^3.0.139",
+    "@ai-sdk/gateway": "^4.0.4",
     "@ai-sdk/vue": "^3.0.214",
     "@comark/nuxt": "^0.4.0",
     "@electric-sql/pglite": "^0.5.3",