Fix docs upload directory (#714)

Similar to rapidsai/cudf#15291, fixes the upload directory for docs (`24.04.00a30` => `24.04`).

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

Approvers:
  - AJ Schmidt (https://github.com/ajschmidt8)
  - Jake Awe (https://github.com/AyodeAwe)

URL: #714

ci/build_docs.sh

@@ -2,7 +2,7 @@
 
 set -euo pipefail
 
-export RAPIDS_VERSION_NUMBER="$(rapids-generate-version)"
+export RAPIDS_VERSION_NUMBER="$(rapids-version-major-minor)"
 
 rapids-logger "Create test conda environment"
 . /opt/conda/etc/profile.d/conda.sh