fix(deps): update nextjs monorepo to ^14.2.21 (#1727)

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

apps/nextjs/package.json

@@ -65,7 +65,7 @@
     "glob": "^11.0.0",
     "jotai": "^2.10.4",
     "mantine-react-table": "2.0.0-beta.7",
-    "next": "^14.2.20",
+    "next": "^14.2.21",
     "postcss-preset-mantine": "^1.17.0",
     "prismjs": "^1.29.0",
     "react": "^19.0.0",