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

Build failed. https://zuul.opendev.org/t/openstack/buildset/def7328064a94c6b88c4fde8ee50cd... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6dae4a7abcd44ad98b89fcb7980e63fd : SUCCESS in 4m 35s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/9f599370980040d1875c4230be300339 : SUCCESS in 4m 46s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/dd44d562988a48c4969d4e186ade71c0 : SUCCESS in 4m 34s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/be6213bf4a584a72aa4d039e18cdf736 : FAILURE in 5m 04s