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

Build failed. https://zuul.opendev.org/t/openstack/buildset/943560ecfd9547ac97de3c4857389e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/c57821f9e1ac4652a645fa00c10074b1 : SUCCESS in 5m 08s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/beb03191186541fbab4756267c91c318 : SUCCESS in 4m 48s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/034e5c56121a4385acc1b9515c54166b : SUCCESS in 5m 14s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/70b9fe1da6424eddbd2de9a9034cf30e : FAILURE in 4m 08s