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

Build failed. https://zuul.opendev.org/t/openstack/buildset/bc5d7d175ea84a8caf79082689ca53... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/82b63e1e58fb42c7af5944049bd4680b : SUCCESS in 4m 42s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b4aaaeca20f4469b814d265b000c5557 : SUCCESS in 4m 41s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/1a94398d303a4760b1bdf47ffd584c05 : FAILURE in 4m 05s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/2ba6bc6988bb45ef904f49f94e68d706 : SUCCESS in 4m 52s