CI: Automatically install correct version of OSC in image upload job

Author: markgoddard

.github/workflows/overcloud-host-image-upload.yml

@@ -80,7 +80,7 @@ jobs:
       - name: Install OpenStack client
         run: |
           source venvs/kayobe/bin/activate &&
-          pip install python-openstackclient -c https://opendev.org/openstack/requirements/raw/branch/stable/zed/upper-constraints.txt
+          pip install python-openstackclient -c https://opendev.org/openstack/requirements/raw/branch/stable/${{ steps.openstack_release.outputs.openstack_release }}/upper-constraints.txt
 
       - name: Output Rocky Linux 9 image tag
         id: rocky_9_image_tag