chore: bump keystone-keycloak-backend version (#669)

diff --git a/internal/pkg/image_repositories/build_workflow.go b/internal/pkg/image_repositories/build_workflow.go
index 2613d48..3097206 100644
--- a/internal/pkg/image_repositories/build_workflow.go
+++ b/internal/pkg/image_repositories/build_workflow.go
@@ -42,7 +42,7 @@
 	"glance":        {"glance_store[cinder]"},
 	"horizon":       {"git+https://github.com/openstack/designate-dashboard.git@stable/${{ matrix.release }}", "git+https://github.com/openstack/heat-dashboard.git@stable/${{ matrix.release }}", "git+https://github.com/openstack/ironic-ui.git@stable/${{ matrix.release }}", "git+https://github.com/vexxhost/magnum-ui.git@stable/${{ matrix.release }} git+https://github.com/openstack/neutron-vpnaas-dashboard.git@stable/${{ matrix.release }} git+https://github.com/openstack/octavia-dashboard.git@stable/${{ matrix.release }} git+https://github.com/openstack/senlin-dashboard.git@stable/${{ matrix.release }}", "git+https://github.com/openstack/monasca-ui.git@stable/${{ matrix.release }}", "git+https://github.com/openstack/manila-ui.git@stable/${{ matrix.release }}"},
 	"ironic":        {"python-dracclient", "sushy"},
-	"keystone":      {"keystone-keycloak-backend==0.1.5"},
+	"keystone":      {"keystone-keycloak-backend==0.1.6"},
 	"magnum":        {"magnum-cluster-api==0.6.0"},
 	"monasca-agent": {"libvirt-python", "python-glanceclient", "python-neutronclient", "python-novaclient", "py3nvml"},
 	"neutron":       {"neutron-vpnaas"},