⬆️ Bump litellm from 1.52.9 to 1.56.4

Bumps [litellm](https://github.com/BerriAI/litellm) from 1.52.9 to 1.56.4.
- [Release notes](https://github.com/BerriAI/litellm/releases)
- [Commits](BerriAI/litellm@v1.52.9...v1.56.4)

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

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