fix(deps): update nextjs monorepo to v15.5.4 (#4178)

Co-authored-by: homarr-renovate[bot] <158783068+homarr-renovate[bot]@users.noreply.github.com>

packages/settings/package.json

@@ -27,7 +27,7 @@
     "@homarr/db": "workspace:^0.1.0",
     "@homarr/server-settings": "workspace:^0.1.0",
     "@mantine/dates": "^8.3.1",
-    "next": "15.5.3",
+    "next": "15.5.4",
     "react": "19.1.1",
     "react-dom": "19.1.1"
   },