Update app.py to Gradio==2.6.4

# to correct 'Blocks' Runtime error from 2.6.4 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==2.6.4")  # to correct 'socket-options' Runtime error from  3.28.1 to Gradio==2.6.4
+import os 
+os.system("pip uninstall -y gradio")
+os.system("pip install gradio==2.6.4")  # to correct 'Blocks' Runtime error from  2.6.4 to Gradio==2.6.4
 
 import gradio as gr
 from transformers import pipeline