chore(deps): bump next from 16.3.6 to 16.3.8

Bumps [next](https://github.com/vercel/next.js) from 16.3.6 to 16.3.8.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Commits](vercel/next.js@v16.3.6...v16.3.8)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.3.8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

apps/site/package.json

@@ -37,7 +37,7 @@
     "fumadocs-mdx": "15.2.3",
     "fumadocs-ui": "16.15.4",
     "lucide-react": "^1.43.0",
-    "next": "16.3.6",
+    "next": "16.3.8",
     "react": "19.2.8",
     "react-dom": "19.2.8",
     "tailwind-merge": "^3.6.0"