add back concurrency limit

main.py

@@ -411,7 +411,6 @@ def start_frontend(retriever: Retriever, analyzer_type: str, coding_llm, retriev
 
                 gr.ChatInterface(
                     fn=chat_fn,
-                    concurrency_limit=None,
                     multimodal=False, # we manually handle multimodal input
                     textbox=gr.MultimodalTextbox(file_types=["image", ".pdf"], placeholder=i18n("placeholder"), file_count='multiple'),
                     examples=[