refactor(tts): simplify gradio component update calls

app.py

@@ -252,8 +252,8 @@ def create_tts_tab():
                         def update_piper_voices(language):
                             if piper_model:
                                 voices = piper_model.get_available_voices(language)
-                                return gr.Dropdown.update(choices=voices, value=voices[0] if voices else None)
-                            return gr.Dropdown.update(choices=[], value=None)
+                                return gr.update(choices=voices, value=voices[0] if voices else None)
+                            return gr.update(choices=[], value=None)
                         
                         piper_voice = gr.Dropdown(
                             label="Voice",
@@ -305,7 +305,7 @@ def create_tts_tab():
                         def update_kokoro_voices(language):
                             lang_code = get_lang_code(language)
                             voices = get_kokoro_voices(lang_code)
-                            return gr.Dropdown.update(choices=voices, value=voices[0] if voices else None)
+                            return gr.update(choices=voices, value=voices[0] if voices else None)
                         
                         kokoro_voice = gr.Dropdown(
                             label="Voice",