Update nextjs

https://vercel.com/kb/bulletin/security-bulletin-cve-2025-55184-and-cve-2025-55183

Author: Janhouse

package.json

@@ -31,7 +31,7 @@
     "drizzle-kit": "^0.31.4",
     "drizzle-orm": "^0.44.5",
     "lucide-react": "^0.526.0",
-    "next": "15.5.7",
+    "next": "15.5.9",
     "next-themes": "^0.4.6",
     "pg": "^8.16.3",
     "postgres": "^3.4.7",