fix: bump litellm from 0.1.758 to 0.1.819

Bumps [litellm](https://github.com/BerriAI/litellm) from 0.1.758 to 0.1.819.
- [Release notes](https://github.com/BerriAI/litellm/releases)
- [Commits](https://github.com/BerriAI/litellm/commits)

---
updated-dependencies:
- dependency-name: litellm
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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