chore(deps-dev): bump next from 15.5.7 to 16.0.8

Bumps [next](https://github.com/vercel/next.js) from 15.5.7 to 16.0.8.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.7...v16.0.8)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.0.8
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/docs/package.json

@@ -47,7 +47,7 @@
     "@types/styled-components": "^5.1.34",
     "eslint-plugin-mdx": "^3.6.2",
     "jsx-to-string-loader": "^1.2.0",
-    "next": "^15.5.7",
+    "next": "^16.0.8",
     "typescript": "^5.9.3"
   }
 }