Bump stackhpc.openstack collection

This fixes a parsing error that requires loop labels to be strings which
is raised from ansible-core 2.15 onwards

Author: Alex-Welsh

requirements.yml

@@ -3,4 +3,4 @@ collections:
   - name: openstack.cloud
     version: 2.4.1
   - name: stackhpc.openstack
-    version: 0.2.4
+    version: 0.4.1