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

Build failed. https://zuul.opendev.org/t/openstack/buildset/dc6b354f1b2b46abbf79f13f9e0f3d... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ef72515a617f41d9b1b397ccdcb8cc7e : SUCCESS in 5m 36s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ff6fc077f32544ab8fa1d8da33e619ee : SUCCESS in 4m 49s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d09d30c0176840dcaaa374b2861ced22 : SUCCESS in 5m 25s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8dafa6a830a2428caab18c4ab33df249 : FAILURE in 4m 14s