Add Python 3.13 Support

[0xrohitgarg]

Description:

The openai-function-calling package currently specifies Python version support as >=3.9, <3.13. This limitation causes compatibility issues for users running Python 3.13, preventing them from installing or using the package.

Steps to Reproduce:

• Install Python 3.13 on your machine.
• Attempt to install openai-function-calling.
• Observe that installation fails due to the version restriction.

[jakecyr]

Published a new version with 3.13 support:

https://pypi.org/project/openai-function-calling/2.3.0/