update global.json in dotnet-run-openai-test-and-notebook.yml

[LittleLittleCloud]

Why are these changes needed?

Related issue number

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• 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 (f8d6e7d) 30.82% compared to head (30a3aca) 30.82%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1135   +/-   ##
=======================================
  Coverage   30.82%   30.82%           
=======================================
  Files          30       30           
  Lines        4033     4033           
  Branches      915      915           
=======================================
  Hits         1243     1243           
  Misses       2711     2711           
  Partials       79       79           

Flag	Coverage Δ
unittests	30.77% <ø> (ø)

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