👨‍🔧 fix nextjs cve vulnerability

Author: jaka-k

frontend/package.json

@@ -53,7 +53,7 @@
     "firebase": "^11.3.1",
     "highlight.js": "^11.11.1",
     "lucide-react": "^0.428.0",
-    "next": "^15.2.2",
+    "next": "^15.4.8",
     "pino": "^9.6.0",
     "pino-loki": "^2.5.0",
     "react": "^19.0.0",