fix(deps): update dependency next to v15

Author: renovate[bot]

package.json

@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "@vercel/og": "0.5.20",
-    "next": "^13.0.5",
+    "next": "^15.0.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0"
   },