Bump py-xgboost CI dep to 2.0.3

[charlesbluca]

Testing the viability of this suggestion from @jakirkham:

rapidsai/dask-build-environment#87 (comment)

[jakirkham]

Thanks Charles! 🙏

Looks like it worked 🎉

Can see it is installed here

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.47%. Comparing base (6706433) to head (86a5a85).
Report is 13 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1314   +/-   ##
=======================================
  Coverage   85.47%   85.47%           
=======================================
  Files          77       77           
  Lines        4242     4242           
  Branches      790      790           
=======================================
  Hits         3626     3626           
  Misses        448      448           
  Partials      168      168           

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