Use Cython 3 for cuproj. (#1309)

This updates cuproj's conda recipe to use `cython >=3.0.0` to align with other RAPIDS packages.

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Mark Harris (https://github.com/harrism)
  - https://github.com/jakirkham
  - Ray Douglass (https://github.com/raydouglass)

URL: #1309

conda/recipes/cuproj/meta.yaml

@@ -53,7 +53,7 @@ requirements:
   host:
     - cuda-version ={{ cuda_version }}
     - cmake {{ cmake_version }}
-    - cython >=0.29,<0.30
+    - cython >=3.0.0
     - python
     - rmm ={{ minor_version }}
     - scikit-build >=0.13.1