feat: Update GPT Model to gpt-4o due to retirement of gpt-35-turbo-16k#1664

Prasanjeet-Microsoft wants to merge 1 commit intodevAzure-Samples/chat-with-your-data-solution-accelerator:devfrom

PSL-update-gptmodelAzure-Samples/chat-with-your-data-solution-accelerator:PSL-update-gptmodelCopy head branch name to clipboard