style: remove trailing whitespace

nanobot/providers/litellm_provider.py

@@ -298,7 +298,7 @@ class LiteLLMProvider(LLMProvider):
 
         reasoning_content = getattr(message, "reasoning_content", None) or None
         thinking_blocks = getattr(message, "thinking_blocks", None) or None
-        
+
         return LLMResponse(
             content=content,
             tool_calls=tool_calls,