Unpin CCCL version used for RAPIDS testing (#6349)

Reverts part of #5973

This change removes the hardcoded CCCL_TAG and CCCL_VERSION values,
allowing the workflow to use the override inputs as intended.

Author: bdice

.github/workflows/build-rapids.yml

@@ -85,10 +85,8 @@ jobs:
           role-duration-seconds: 43200 # 12h
       - name: Run command # Do not change this step's name, it is checked in parse-job-times.py
         env:
-          # TODO: Temporarily hardcoding the override while RAPIDS gets updated
-          # for the various breaking changes in cudax between 3.0/3.1/3.2
-          CCCL_TAG: branch/3.1.x
-          CCCL_VERSION: 3.1.0
+          CCCL_TAG: ${{ inputs.override_cccl_tag }}
+          CCCL_VERSION: ${{ inputs.override_cccl_version }}
           CI: true
           RAPIDS_LIBS: ${{ matrix.libs }}
           # Uncomment any of these to customize the git repo and branch for a RAPIDS lib: