fix: replace gradio>=5.0.0 with audioop-lts to fix Python 3.13 compatibility on HF Spaces

requirements.txt

@@ -10,4 +10,4 @@ requests>=2.31.0
 beautifulsoup4>=4.12.0
 feedparser>=6.0.0
 lxml>=5.0.0
-gradio>=5.0.0
+audioop-lts>=0.2.1