Sweep: update to latest OpenAI version (✓ Sandbox Passed)

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PR Feedback: 👎

Description

This pull request updates the OpenAI version used in the project and makes some changes to the requirements.txt file and main.py file.

Summary

• Updated OpenAI version to 1.13.3
• Updated langchain.chat_models import to langchain.openai_chat_models import in main.py
• Updated OPENAI_MODEL environment variable to "gpt-4" in main.py
• Updated OPENAI_API_VERSION environment variable to "2023-09-01" in main.py
• Replaced ChatOpenAI with ChatGPT and AzureChatOpenAI with AzureChatGPT in main.py

Fixes #32.

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Rollback Files For Sweep

• [ ] Rollback changes to shell_ai/main.py
• [ ] Rollback changes to requirements.txt

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Apply Sweep Rules to your PR?

• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.

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