bump version to 0.2.2

[sonichi]

Why are these changes needed?

Choose the right openai version.

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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fd84ef1) 26.72% compared to head (4fdde17) 38.08%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #906       +/-   ##
===========================================
+ Coverage   26.72%   38.08%   +11.35%     
===========================================
  Files          28       28               
  Lines        3768     3768               
  Branches      854      896       +42     
===========================================
+ Hits         1007     1435      +428     
+ Misses       2687     2204      -483     
- Partials       74      129       +55     

Flag	Coverage Δ
unittests	38.03% <100.00%> (+11.35%)	⬆️

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