GRAL-5870 bump eslint-config-next package in custom-ui-floating-window app

Author: siirimangus

apps/custom-ui-floating-window-demo/package-lock.json

@@ -13,7 +13,7 @@
     "@prisma/client": "^4.6.1",
     "bootstrap": "^5.2.3",
     "cookies-next": "^6.1.1",
-    "eslint-config-next": "15.5.14",
+    "eslint-config-next": "15.5.15",
     "form-data": "^4.0.5",
     "next": "^15.5.15",
     "pino": "^8.7.0",