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

Build failed. https://zuul.opendev.org/t/openstack/buildset/86833ded53a6423aaafb9292f26966... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e2bd71214d2e450d9f35354e11d98d90 : SUCCESS in 4m 54s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/400505fa2da44a44bab061b23f2b1943 : SUCCESS in 6m 12s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/20538af641a0483d9faf58af26456caf : SUCCESS in 4m 28s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d682682b6244430a9a0289be17ff71cf : FAILURE in 5m 12s