fix(deps): update dependency next to v16 [security]

Author: renovate[bot]

package.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "@next/mdx": "15.5.11",
     "motion": "^10.18.0",
-    "next": "15.2.6",
+    "next": "16.0.0",
     "normalize.css": "8.0.1",
     "react": "19.2.4",
     "react-dom": "19.2.4",