remove unused variables in build_docs script (#1469)

Contributes to rapidsai/build-planning#106

This project doesn't need any of the changes that are being made as part of that issue across most other repos... it's already doing all of its `pip` and `conda` installs in CI in single installs (which is strict and safe) 🎉 

This small PR just makes its handling of environment variables in `ci/build_docs.sh` consistent with other RAPIDS repos, in the interest of keeping those scripts looking similar so it's easy to apply changes across all RAPIDS projects. ref: rapidsai/cudf#17013 (comment)

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

Approvers:
  - Mark Harris (https://github.com/harrism)
  - Mike Sarahan (https://github.com/msarahan)

URL: #1469

ci/build_docs.sh

@@ -23,7 +23,6 @@ rapids-print-env
 
 export RAPIDS_VERSION="$(rapids-version)"
 export RAPIDS_VERSION_MAJOR_MINOR="$(rapids-version-major-minor)"
-export RAPIDS_VERSION_NUMBER="24.12"
 export RAPIDS_DOCS_DIR="$(mktemp -d)"
 
 rapids-logger "Build cuSpatial CPP docs"
@@ -54,4 +53,4 @@ mkdir -p "${RAPIDS_DOCS_DIR}/cuproj/html"
 mv _html/* "${RAPIDS_DOCS_DIR}/cuproj/html"
 popd
 
-rapids-upload-docs
+RAPIDS_VERSION_NUMBER="${RAPIDS_VERSION_MAJOR_MINOR}" rapids-upload-docs

ci/release/update-version.sh

@@ -40,7 +40,6 @@ echo "${NEXT_FULL_TAG}" > VERSION
 for FILE in .github/workflows/*.yaml; do
   sed_runner "/shared-workflows/ s/@.*/@branch-${NEXT_SHORT_TAG}/g" "${FILE}"
 done
-sed_runner "s/RAPIDS_VERSION_NUMBER=\".*/RAPIDS_VERSION_NUMBER=\"${NEXT_SHORT_TAG}\"/g" ci/build_docs.sh
 
 DEPENDENCIES=(
   pylibcudf