Fix LangChain deprecation warning

[donbcolab]

Update to convert_to_openai_function to fix LangChain deprecation

Change Description

This pull request updates the usage of format_tool_to_openai_function to convert_to_openai_function in the api/packages/neo4j-clinical-layer/neo4j_clinical_layer/agent.py file.

Reason for Change

The format_tool_to_openai_function was deprecated in LangChain 0.1.16 and will be removed in version 1.0. This update ensures compatibility with future LangChain versions and removes deprecation warnings.

Impact

This change should not affect the functionality of the clinical agent but will remove deprecation warnings and ensure future compatibility.

Testing Steps

1. Run the clinical agent with the updated code.
2. Verify that no deprecation warnings related to format_tool_to_openai_function are displayed.
3. Ensure that all existing functionality continues to work as expected, particularly the interaction between Neo4j tools and OpenAI functions.

Additional Notes

• This change requires LangChain version 0.1.16 or higher.
• No changes to dependencies are required as convert_to_openai_function is part of the core LangChain library.

[tomasonjo]

Thanks