Update gpt-4o model version and add new model details

[keenranger]

• Add version information for gpt-4o-2024-11-20
• Update model pointer

Signed-off-by: Hankyeol Kyung [email protected]

Why are these changes needed?

There is no support for latest 4o model, So I added it.

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/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.

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.40%. Comparing base (c5ca53d) to head (5293387).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5056      +/-   ##
==========================================
- Coverage   69.41%   69.40%   -0.01%     
==========================================
  Files         163      163              
  Lines       10494    10494              
==========================================
- Hits         7284     7283       -1     
- Misses       3210     3211       +1     

Flag	Coverage Δ
unittests	69.40% <ø> (-0.01%)	⬇️

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