fix: package.json & package-lock.json to reduce vulnerabilities

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

Author: snyk-bot

package-lock.json

@@ -86,7 +86,7 @@
     "lucide-react": "^0.451.0",
     "nanoid": "^5.0.9",
     "nanoid": "^5.0.7",
-    "next": "^14.2.21",
+    "next": "^15.2.2",
     "next-auth": "^4.24.9",
     "next-safe-action": "^7.9.4",
     "next-themes": "^0.3.0",