change concurrency_count to default_concurrency_limit

app.py

@@ -147,4 +147,4 @@ with gr.Blocks(css=css) as demo:
 
         text_button.click(flip_text, inputs=[prompt, negative_prompt, model, steps, sampler, cfg_scale, width, height, seed], outputs=image_output)
 
-demo.queue(concurrency_count=24, max_size=32, api_open=False).launch(max_threads=128)
+demo.queue(default_concurrency_limit=24, max_size=32, api_open=False).launch(max_threads=128)