Add cudf-polars to the rapids metapackage. (#732)

Follow-up to rapidsai/cudf#17037.

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

Approvers:
  - James Lamb (https://github.com/jameslamb)

URL: #732

conda/recipes/rapids/meta.yaml

@@ -36,6 +36,7 @@ requirements:
     - nvtx {{ nvtx_version }}
     - python
     - cudf ={{ major_minor_version }}.*
+    - cudf-polars ={{ major_minor_version }}.*
     - cuvs ={{ major_minor_version }}.*
     - cugraph ={{ major_minor_version }}.*
     - nx-cugraph ={{ major_minor_version }}.*