chore(deps): bump ai from 4.2.10 to 4.3.13

Bumps [ai](https://github.com/vercel/ai) from 4.2.10 to 4.3.13.
- [Release notes](https://github.com/vercel/ai/releases)
- [Changelog](https://github.com/vercel/ai/blob/main/CHANGELOG.md)
- [Commits](https://github.com/vercel/ai/compare/[email protected]@4.3.13)

---
updated-dependencies:
- dependency-name: ai
  dependency-version: 4.3.13
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

packages/fern-docs/search-ui/package.json

@@ -65,7 +65,7 @@
     "@types/react": "19.0.10",
     "@types/react-dom": "19.0.4",
     "@upstash/qstash": "^2.7.16",
-    "ai": "^4.3.8",
+    "ai": "^4.3.13",
     "cssnano": "^6.0.3",
     "jotai": "^2.12.1",
     "next": "15.3.0-canary.1",