Remove unused openai import

Author: endolith

interpreter/core/respond.py

@@ -6,7 +6,6 @@
 
 os.environ["LITELLM_LOCAL_MODEL_COST_MAP"] = "True"
 import litellm
-import openai
 
 from ..terminal_interface.utils.display_markdown_message import display_markdown_message
 from .render_message import render_message