Update app.py

Trying to fix error "ImportError: libGL.so.1: cannot open shared object file: No such file or directory"

app.py

@@ -1,5 +1,7 @@
 # Based on https://huggingface.co/spaces/akhaliq/Detic/tree/main Thanks!
 import os 
+os.system("apt-get update && apt-get install libgl1")
+
 os.system("pip install gradio==2.4.6")
 import sys
 import gradio as gr