chore(deps): bump next from 16.1.2 to 16.1.5

Bumps [next](https://github.com/vercel/next.js) from 16.1.2 to 16.1.5.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v16.1.2...v16.1.5)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.1.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

packages/site/package.json

@@ -30,7 +30,7 @@
     "fumadocs-core": "^16.4.7",
     "fumadocs-mdx": "^14.2.5",
     "fumadocs-ui": "^16.4.7",
-    "next": "^16.1.2",
+    "next": "^16.1.6",
     "openai": "^4.0.0",
     "postcss": "^8.5.6",
     "react": "^19.2.3",