update: llamaindex_conversable_agent.py

[lazToum]

Why are these changes needed?

If using pydantic > 2, we get AttributeError: type object 'Config' has no attribute 'copy'
A simple check is added to avoid this.

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.

[marklysze]

Hey @lazToum! Thanks for putting these PRs through. Are you on Discord? If so can you connect to me, msze_, so we can send out a CLA for you?

[lazToum]

Hey @lazToum! Thanks for putting these PRs through. Are you on Discord? If so can you connect to me, msze_, so we can send out a CLA for you?

Hi @marklysze, sure, it's laztoum at discord. I have already signed one that Qingyun Wu sent me.

[qingyun-wu]

LGTM! @lazToum thanks for your contribution!