`app.py`: bump concurrency to 64

app.py

@@ -366,5 +366,5 @@ 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=32)
+demo.queue(concurrency_count=64)
 demo.launch()