Upgrade nextjs (#885)

Author: pedromcunha

demo/package.json

@@ -38,7 +38,7 @@
     "@solana/web3.js": "~1.98.2",
     "@tanstack/react-query": "^5.20.2",
     "@types/node": "^22.5.4",
-    "next": "15.5.7",
+    "next": "15.5.9",
     "next-remote-watch": "^1.0.0",
     "next-themes": "^0.2.0",
     "porto": "^0.0.85",