Bump next from 14.2.21 to 14.2.26 in /references/nextjs-realtime

Bumps [next](https://github.com/vercel/next.js) from 14.2.21 to 14.2.26.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.21...v14.2.26)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 14.2.26
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

references/nextjs-realtime/package.json

@@ -30,7 +30,7 @@
     "date-fns": "^4.1.0",
     "langsmith": "^0.2.15",
     "lucide-react": "^0.451.0",
-    "next": "14.2.21",
+    "next": "14.2.26",
     "openai": "^4.68.4",
     "react": "^18",
     "react-dom": "^18",