Update AGS pyproject.toml

[victordibia]

Why are these changes needed?

Removes python upperbound for AGS.

Related issue number

Closes #5098

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.91%. Comparing base (0363388) to head (eb1353c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5101   +/-   ##
=======================================
  Coverage   69.91%   69.91%           
=======================================
  Files         168      168           
  Lines       10698    10698           
=======================================
  Hits         7479     7479           
  Misses       3219     3219           

Flag	Coverage Δ
unittests	69.91% <ø> (ø)

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