Update WikiGPT with GPT-4
This MR implements the following changes for WikiGPT:
- update openai python package
- Use GPT-4 instead of GPT-3.5. GTP4 is implemented within the /chat/completions API instead of the text completions
- GPT4 has an increased window size it can accept as context so w increase the amount of information we pass it from Wikipedia: - Use 4 articles instead of 3 - Use 12 paragraphs from each article instead of 4
Bug: T333854