build(deps): bump ai from 4.3.19 to 7.0.9

Bumps [ai](https://github.com/vercel/ai/tree/HEAD/packages/ai) from 4.3.19 to 7.0.9.
- [Release notes](https://github.com/vercel/ai/releases)
- [Changelog](https://github.com/vercel/ai/blob/main/packages/ai/CHANGELOG.md)
- [Commits](https://github.com/vercel/ai/commits/ai@7.0.9/packages/ai)

---
updated-dependencies:
- dependency-name: ai
  dependency-version: 7.0.9
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]