chore(deps): update dependency eslint-config-next to v15.5.6

Author: renovate[bot]

ui/package.json

@@ -34,7 +34,7 @@
     "@types/react": "^19.2.2",
     "@types/react-dom": "^19.2.2",
     "eslint": "^9.39.1",
-    "eslint-config-next": "15.5.2",
+    "eslint-config-next": "15.5.6",
     "postcss": "^8.5.6",
     "tailwindcss": "^4.1.17",
     "typescript": "^5.9.3"