Update app.py

capitalized "warning" for gradio's warning function, as seen in [docs](https://www.gradio.app/main/docs/gradio/warning).\
should fix the attribute error when using text over 300 characters, don't have hardware or hf pro to test though.\
could also potentially use gr.Error to cancel the generation entirely in case the user wants to change the text to something smaller.

app.py

@@ -73,7 +73,7 @@ def infer(sample_audio_path, target_text, progress=gr.Progress()):
         if len(target_text) == 0:
             return None
         elif len(target_text) > 300:
-            gr.warning("Text is too long. Please keep it under 300 characters.")
+            gr.Warning("Text is too long. Please keep it under 300 characters.")
             target_text = target_text[:300]
             
         input_text = prompt_text + ' ' + target_text