backport Update litellm to fix bedrock models (onyx-dot-app#2649)

Author: rkuo-danswer

backend/danswer/llm/chat_llm.py

@@ -290,10 +290,12 @@ def _completion(
             return litellm.completion(
                 # model choice
                 model=f"{self.config.model_provider}/{self.config.model_name}",
-                api_key=self._api_key,
-                base_url=self._api_base,
-                api_version=self._api_version,
-                custom_llm_provider=self._custom_llm_provider,
+                # NOTE: have to pass in None instead of empty string for these
+                # otherwise litellm can have some issues with bedrock
+                api_key=self._api_key or None,
+                base_url=self._api_base or None,
+                api_version=self._api_version or None,
+                custom_llm_provider=self._custom_llm_provider or None,
                 # actual input
                 messages=prompt,
                 tools=tools,

backend/requirements/default.txt

@@ -28,7 +28,7 @@ jsonref==1.1.0
 langchain==0.1.17
 langchain-core==0.1.50
 langchain-text-splitters==0.0.1
-litellm==1.47.1
+litellm==1.48.7
 llama-index==0.9.45
 Mako==1.2.4
 msal==1.28.0