⬆️(dependencies) update next to v15.4.7 [SECURITY]

Author: renovate[bot]

src/frontend/apps/conversations/package.json

@@ -39,7 +39,7 @@
     "lottie-react": "^2.4.1",
     "luxon": "3.6.1",
     "micromark-extension-llm-math": "3.1.1-20250610",
-    "next": "15.3.3",
+    "next": "15.4.7",
     "posthog-js": "1.249.3",
     "react": "*",
     "react-aria-components": "1.9.0",