fix: upgrade next from 15.1.8 to 15.3.1

Snyk has created this PR to upgrade next from 15.1.8 to 15.3.1.

See this package in npm:
next

See this project in Snyk:
https://app.snyk.io/org/sammytezzy/project/8f1e5f14-eea9-4b1d-9ba4-085c69ff0d08?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

apps/examples/nextjs/package.json

@@ -18,7 +18,7 @@
     "Lluis Agusti <[email protected]>"
   ],
   "dependencies": {
-    "next": "latest",
+    "next": "15.3.1",
     "next-auth": "latest",
     "react": "^18.2.0",
     "react-dom": "^18.2.0"