Update to XGBoost 2 (#693)

Updates the XGBoost constraint to the newer XGBoost 2.

Authors:
  - https://github.com/jakirkham

Approvers:
  - Ray Douglass (https://github.com/raydouglass)

URL: #693

conda/recipes/versions.yaml

@@ -2,7 +2,7 @@
 
 # Versions for `rapids-xgboost` meta-pkg
 xgboost_version:
-  - '=1.7.6'
+  - '=2.0.3'
 
 cuda11_cuda_python_version:
   - '>=11.7.1,<12.0a'