Update requirements.txt

requirements.txt

@@ -19,6 +19,4 @@ uvicorn==0.18.3
 torch==2.0.1
 torchvision==0.15.2
 streamlit-chat
-pydantic-settings==1.1.0  # Use specific versions
-pydantic>=1.9.0
-chromadb==0.4.1
+pydantic-settings