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

Build failed. https://zuul.opendev.org/t/openstack/buildset/c239002ba43c4419a1aa16452f7ff5... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/71cbc89339d442bbaf3f957491f8708c : SUCCESS in 6m 52s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/2265f5e14c814ee0a06ff66636c4b5ad : SUCCESS in 5m 09s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/5a917cca776f4a1193cb1433530a7d2c : SUCCESS in 4m 40s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/3755afbb3ebf461a89988f3e2adb794f : FAILURE in 4m 42s