Update dependency next to v15 [SECURITY]

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

apps/example/package.json

@@ -15,7 +15,7 @@
     "@next/mdx": "^12.3.1",
     "@rainbow-me/rainbowkit": "^1.0.0",
     "viem": "^0.3.21",
-    "next": "12.2.4",
+    "next": "15.5.10",
     "react": "17.0.2",
     "react-dom": "17.0.2",
     "react-syntax-highlighter": "^15.5.0",