ensure VLASS workflows only run on VLASS nodes

shared/workspaces/alembic/versions/dc83011fcd2f_correct_vlass_wfs_to_use_vlass_nodes.py

@@ -43,6 +43,6 @@ def downgrade():
         SET content= regexp_replace(convert_from(content, 'utf-8'),
         E'requirements = (VLASS == True) && (HasLustre == True)\\n+partition = "VLASS"',
         E'requirements = HasLustre == True')::bytea
-        WHERE workflow_name in ({affected_workflows}) AND filename like ('%.condor')
+        WHERE workflow_name in {str(affected_workflows)} AND filename like ('%.condor')
         """
     )