Bump litellm from 1.61.17 to 1.61.20 (#1175)

Bumps [litellm](https://github.com/BerriAI/litellm) from 1.61.17 to 1.61.20.
- [Release notes](https://github.com/BerriAI/litellm/releases)
- [Commits](https://github.com/BerriAI/litellm/commits)

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

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

Author: dependabot[bot]

Diff for: poetry.lock

@@ -14,7 +14,7 @@ PyYAML = "==6.0.2"
 fastapi = "==0.115.11"
 uvicorn = "==0.34.0"
 structlog = "==25.1.0"
-litellm = "==1.61.17"
+litellm = "==1.61.20"
 llama_cpp_python = "==0.3.5"
 cryptography = "==44.0.2"
 sqlalchemy = "==2.0.38"
@@ -50,7 +50,7 @@ ruff = "==0.9.9"
 bandit = "==1.8.3"
 build = "==1.2.2.post1"
 wheel = "==0.45.1"
-litellm = "==1.61.17"
+litellm = "==1.61.20"
 pytest-asyncio = "==0.25.3"
 llama_cpp_python = "==0.3.5"
 scikit-learn = "==1.6.1"