chore(deps): Update dependency next to v15.2.1 (#69)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

frontend/package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "@heroicons/react": "2.2.0",
     "clsx": "2.1.1",
-    "next": "15.2.0",
+    "next": "15.2.1",
     "react": "19.0.0",
     "react-dom": "19.0.0",
     "use-debounce": "10.0.4"