Update app.py

app.py

@@ -1,6 +1,10 @@
 import os
 os.system('pip install detectron2 -f https://dl.fbaipublicfiles.com/detectron2/wheels/cu102/torch1.9/index.html')
 
+# work around: https://discuss.huggingface.co/t/how-to-install-a-specific-version-of-gradio-in-spaces/13552
+os.system("pip uninstall -y gradio")
+os.system("pip install gradio==3.4.1")
+
 from os import getcwd, path, environ
 import deepdoctection as dd
 from deepdoctection.dataflow.serialize import DataFromList