chore(deps): bump @ai-sdk/google from 3.0.82 to 4.0.18

Bumps [@ai-sdk/google](https://github.com/vercel/ai/tree/HEAD/packages/google) from 3.0.82 to 4.0.18.
- [Release notes](https://github.com/vercel/ai/releases)
- [Changelog](https://github.com/vercel/ai/blob/main/packages/google/CHANGELOG.md)
- [Commits](https://github.com/vercel/ai/commits/@ai-sdk/google@4.0.18/packages/google)

---
updated-dependencies:
- dependency-name: "@ai-sdk/google"
  dependency-version: 4.0.18
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]