GPT4o, fix UM GPT sunset

app.py

@@ -1694,6 +1694,7 @@ def content_llm_cost():
 
 def content_prompt_and_llm_version():
     st.info("Note: The default settings may not work for your particular image. If VoucherVision does not produce the results that you were expecting: 1) try disabling the LM2 collage 2) Then try enabling 2 copies of OCR, SLTPvB_long prompt, Azure GPT 4. We are currently building 'recipes' for different scenarios, please stay tuned!")
+    st.info("UPDATE: May 25, 2024 - The default LLM used to be Azure GPT-3.5, which was served by the University of Michigan. However, UofM has sunset all but GPT-4 Turbo so that is now the default LLM. If you ran VV prior to this update and saw an empty result, that was the reason.")
     st.header('Prompt Version')
     col_prompt_1, col_prompt_2 = st.columns([4,2])              
     with col_prompt_1: