Update app.py Gradio==2.6.4

# to correct 'socket-options' Runtime error from 3.28.1 to Gradio==2.6.4

app.py

@@ -1,7 +1,7 @@
 # to correct runtime error 01-03-2024
 import os 
 os.system("pip uninstall -y gradio")
-os.system("pip install gradio==3.28.1")  # to correct 'socket-options' Runtime error from  3.28.3 to 3.28.1
+os.system("pip install gradio==2.6.4")  # to correct 'socket-options' Runtime error from  3.28.1 to Gradio==2.6.4
 
 import gradio as gr
 from transformers import pipeline