Bump litellm from 1.55.0 to 1.55.4

Bumps [litellm](https://github.com/BerriAI/litellm) from 1.55.0 to 1.55.4.
- [Release notes](https://github.com/BerriAI/litellm/releases)
- [Commits](BerriAI/litellm@v1.55.0...v1.55.4)

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

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

Author: dependabot[bot]

poetry.lock

@@ -13,7 +13,7 @@ fastapi = ">=0.115.5"
 uvicorn = ">=0.32.1"
 weaviate-client = ">=4.9.6"
 structlog = ">=24.4.0"
-litellm = "^1.55.0"
+litellm = "^1.55.4"
 llama_cpp_python = ">=0.3.2"
 cryptography = "^44.0.0"
 sqlalchemy = "^2.0.28"