enable example caching to avoid re-generating

this will save time by caching examples after the first generation & avoid re-generating

app.py

@@ -179,7 +179,7 @@ def start_app():
                     inputs=[ref_img, audio, resolution],
                     outputs=output_video,
                     fn=app.predict,
-                    cache_examples=False,
+                    cache_examples="lazy",
                 )
 
     demo.launch(