build(deps): bump next from 14.2.10 to 14.2.15 in /example (#447)

Author: dependabot[bot]

example/package-lock.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "@supabase/realtime-js": "file:..",
-    "next": "^14.2.10",
+    "next": "^14.2.15",
     "react": "^18.2.0",
     "react-dom": "^18.2.0"
   },