upgrade to avoid react cve

Author: andy-sorge

package-lock.json

@@ -15,7 +15,7 @@
     "@next/mdx": "^15.5.3",
     "@types/mdx": "^2.0.13",
     "lucide-react": "^0.544.0",
-    "next": "15.5.3",
+    "next": "15.5.9",
     "react": "19.1.1",
     "react-dom": "19.1.1",
     "rehype-autolink-headings": "^7.1.0",