Bump litellm from 1.58.0 to 1.59.0 (#645)

Bumps [litellm](https://github.com/BerriAI/litellm) from 1.58.0 to 1.59.0.
- [Release notes](https://github.com/BerriAI/litellm/releases)
- [Commits](BerriAI/litellm@v1.58.0...v1.59.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Diff for: poetry.lock

@@ -12,7 +12,7 @@ PyYAML = "==6.0.2"
 fastapi = "==0.115.6"
 uvicorn = "==0.34.0"
 structlog = "==25.1.0"
-litellm = "==1.58.0"
+litellm = "==1.59.0"
 llama_cpp_python = "==0.3.5"
 cryptography = "==44.0.0"
 sqlalchemy = "==2.0.37"
@@ -38,7 +38,7 @@ ruff = "==0.9.2"
 bandit = "==1.8.2"
 build = "==1.2.2.post1"
 wheel = "==0.45.1"
-litellm = "==1.58.0"
+litellm = "==1.59.0"
 pytest-asyncio = "==0.25.2"
 llama_cpp_python = "==0.3.5"
 scikit-learn = "==1.6.1"