Bump next from 14.2.25 to 14.2.26 in /demos/next14-app-router

Bumps [next](https://github.com/vercel/next.js) from 14.2.25 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@v14.2.25...v14.2.26)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

demos/next14-app-router/package-lock.json

@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "@t3-oss/env-nextjs": "^0.7.1",
-    "next": "^14.2.25",
+    "next": "^14.2.26",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "zod": "^3.22.4"