fix: Update import for ChatOpenAI due to deprecation

[anouardbt]

Description:

This PR addresses the deprecation warnings and import errors encountered in the 02_🧠_LLM.py script of the dbt-sl-streamlit project. The following changes have been made:

1. Import Fix:

   • Updated the import statement for ChatOpenAI to reflect the latest package structure.
   • The previous import from langchain_community.llms has been corrected to from langchain_openai import ChatOpenAI.

2. Initialization Adjustment:

   • Modified the initialization of ChatOpenAI in the script to align with the new recommended method.

Background:
The project was encountering the following warnings and errors due to deprecated import paths and initialization methods for ChatOpenAI:

• LangChainDeprecationWarning: Importing LLMs from langchain is deprecated.
• UserWarning: The method of initializing chat models was outdated.
• ImportError: ChatOpenAI could not be imported from langchain_community.llms.

By updating the import statement and initialization method, these issues have been resolved, ensuring compatibility with the latest version of langchain.

Testing:

• Verified that the script runs without warnings or errors after the changes.
• Tested the functionality of ChatOpenAI to ensure it operates as expected.

Dependencies:

• Ensure that the langchain-openai package is installed and updated to the latest version:

  pip install -U langchain-openai

Notes:

• Users should update their local environments to align with these changes.
• Refer to the langchain documentation for any further updates on package structures and initialization methods.

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Please review the changes and provide feedback or approval for merging into the main branch.