Update support for Python 3.13

[marklysze]

Why are these changes needed?

With Python 3.13 released last month, any new updates or installs of Python will be version 3.13 and this is not supported at the moment for pip installing. Additionally, tests are not being run for Python 3.13.

Updated support for 3.13 for installing and testing.

Includes:

• Fix for a test related to GraphRag
• Fix for a test for llama indexindex conversable agent
• Fix for a test due to a change in json error messages in Python 3.13

Important:

• Numpy 2.1+ (Aug 2024) is the first version to support Python 3.13 - so we are including numpy 2.1 when using python 3.13. Hopefully this does not have any issues with other external packages.

Related issue number

Checks

• I've included any doc changes needed for https://ag2ai.github.io/ag2/. See https://ag2ai.github.io/ag2/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[qingyun-wu]

There are tests failed. Should we worry about those?

[marklysze]

There are tests failed. Should we worry about those?

Let me check...

[qingyun-wu]

Thanks Mark!