[Openstack-stable-maint] Stable check of openstack/tooz for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/c4dce0f1d73a4e0d9d6f53f2159b9b... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a42ff05a104d4b09a31e06b9ec65f011 : SUCCESS in 4m 52s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/75ed369b347a459693cf3722fb6c0e27 : SUCCESS in 4m 15s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/2bb0f9f7429d4cda980b1fc825ef5ed1 : SUCCESS in 4m 30s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/e3f3925ab41c4bf3ac4e36e554724418 : FAILURE in 4m 36s