app.py: changes for gradio major bump

app.py

@@ -328,4 +328,4 @@ with gr.Blocks(css=css) as demo:
             send_to_txt2img_btn.click(send_to_txt2img, inputs=[image_input], outputs=[tabs, prompt, negative_prompt, steps, seed,
                                                                                           model, sampler, width, height, cfg_scale])
 
-demo.queue(concurrency_count=64, max_size=80, api_open=False).launch(max_threads=256)
+demo.queue(concurrency_limit=64, max_size=80, api_open=False).launch(max_threads=256)