fix: examples/alchemy-daapp/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NEXT-10259370

Author: snyk-bot

examples/alchemy-daapp/package.json

@@ -22,7 +22,7 @@
     "@tanstack/react-query-persist-client": "^4.29.7",
     "axios": "^1.4.0",
     "framer-motion": "^10.12.12",
-    "next": "^13.4.1",
+    "next": "^15.2.2",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "viem": "^1.21.4",