Update app.py

update cache setting to False. (no quotation marks)

app.py

@@ -139,7 +139,7 @@ chat_interface = gr.ChatInterface(
         ),
     ],
     stop_btn=None,
-    cache_examples="false",
+    cache_examples=False,
     examples=[
         ["Explain quantum physics in 5 words or less:"],
         ["Question: What do you call a bear with no teeth?\nAnswer:"],