Resolve failures in updating workflow (#103)

* Explicitly export YAML values to GHA env

* Drop charlesbluca from PR reviewers (handled by codeowners)

.github/workflows/update-gpuci.yml

@@ -17,6 +17,8 @@ jobs:
         uses: the-coding-turtle/[email protected]
         with:
           file: ci/axis/dask.yaml
+          export_to_envs: true
+          return_to_outputs: false
 
       - name: Get old RAPIDS / UCX-Py versions
         run: |
@@ -88,7 +90,6 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: "Update gpuCI `RAPIDS_VER` to `${{ env.NEW_RAPIDS_VER }}`, `UCX_PY_VER` to `${{ env.NEW_UCX_PY_VER }}`"
           title: "Update gpuCI `RAPIDS_VER` to `${{ env.NEW_RAPIDS_VER }}`"
-          reviewers: "charlesbluca"
           author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
           branch: "upgrade-gpuci-rapids"
           body: |