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

Build failed. https://zuul.opendev.org/t/openstack/buildset/1724f990e25b4173a179ec9585f316... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/85c8942c360f4ee288efe0ab9d98d9ce : SUCCESS in 4m 56s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/249f3a59292047798e510089d2266a66 : SUCCESS in 4m 51s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/beccbff63bcc4527b74dabfae88f2612 : SUCCESS in 4m 32s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/9dc72e068f914f639807ac2d0b9c7124 : FAILURE in 6m 12s