app.py: accompany for variable sampling rate of models

app.py

@@ -87,7 +87,7 @@ def main():
             if len(text_str) > 1024:
                 text_str = text_str[:1024]
             samples = cast(TTS, tts).synthesize(text_str, speaker_str)
-            return gr.Audio.update(value=(24000, samples))
+            return gr.Audio.update(value=(cast(TTS, tts).get_sampling_rate(), samples))
 
         generate.click(synthesize_audio, inputs=[text, speaker], outputs=audio)