Update dependency openai to v6

Author: renovate[bot]

package.json

@@ -67,7 +67,7 @@
     "nanoid": "^5.1.5",
     "next": "^15.2.3",
     "next-themes": "^0.4.4",
-    "openai": "^4.91.1",
+    "openai": "^6.0.0",
     "openapi-types": "^12.1.3",
     "pg": "^8.14.1",
     "postgres": "^3.4.5",