Bump next from 16.0.7 to 16.0.9 in /apps/landing

Bumps [next](https://github.com/vercel/next.js) from 16.0.7 to 16.0.9.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v16.0.7...v16.0.9)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.0.9
  dependency-type: direct:production
...

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

Author: dependabot[bot]

apps/landing/package.json

@@ -17,7 +17,7 @@
     "@types/mdx": "^2.0.13",
     "braillify": "workspace:*",
     "katex": "^0.16.25",
-    "next": "16.0.7",
+    "next": "16.0.9",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "react-latex-next": "^3.0.0",