Update dependency next to v16

Author: renovate[bot]

package.json

@@ -9,7 +9,7 @@
   "dependencies": {
     "isomorphic-fetch": "3.0.0",
     "mdi-react": "8.4.0",
-    "next": "15.5.7",
+    "next": "16.0.8",
     "polished": "4.2.2",
     "react": "18.2.0",
     "react-dom": "18.2.0",