Update dependency next to v15.4.9 [SECURITY] (#85)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -21,7 +21,7 @@
     "clsx": "^2.1.0",
     "lucide-react": "^0.359.0",
     "ms": "^2.1.3",
-    "next": "15.4.8",
+    "next": "15.4.9",
     "openai": "^4.37.1",
     "react": "^18",
     "react-dom": "^18",