chore(deps): update next to version 15.5.9

Author: danmaby

package-lock.json

@@ -20,7 +20,7 @@
     "geist": "^1.3.1",
     "lucide": "^0.471.0",
     "lucide-react": "^0.471.1",
-    "next": "15.5.7",
+    "next": "^15.5.9",
     "next-themes": "^0.2.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",