Update app.py

app.py

@@ -1,5 +1,5 @@
 import os 
-os.system('python -m pip install detectron2 -f \
+os.system('python -m pip install detectron2==0.6 -f \
   https://dl.fbaipublicfiles.com/detectron2/wheels/cpu/torch1.9/index.html')
 
 import gradio as gr