Bump ai from 5.0.5 to 5.0.13

Bumps [ai](https://github.com/vercel/ai) from 5.0.5 to 5.0.13.
- [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/ai@5.0.5...ai@5.0.13)

---
updated-dependencies:
- dependency-name: ai
  dependency-version: 5.0.13
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]