Update dependency next to v15 [SECURITY]

Author: renovate[bot]

example/package.json

@@ -9,7 +9,7 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "next": "12.1.0",
+    "next": "15.5.16",
     "nextjs-color-mode": "^1.0.3",
     "react": "17.0.2",
     "react-dom": "17.0.2"