Patch/logging

[lazToum]

Why are these changes needed?

• Handle datetime.utcnow() deprecation warning
• Handle serializing pathlib.Path instances:
  Serializing / logging agents with (e.g.):

  ...
  code_execution_config={"executor":  LocalCommandLineCodeExecutor(work_dir=Path("."))
  ...
  

  Raises a type error (with WindowsPath/PosixPath not being serializable).
  Maybe related: [Bug]: TypeError: Object of type WindowsPath is not JSON serializable microsoft/autogen#2286 (comment)

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 updated tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[marklysze]

Thanks @lazToum...

@Hk669 are you able to assist in testing this?

[Hk669]

Yes, let me test it on windows.

[Hk669]

looks good to me. Thanks @lazToum