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

Build failed. https://zuul.opendev.org/t/openstack/buildset/83008aa5d67c40a19d0810a1b28873... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/254f1ab93b47448d8e4f93b285357b5a : SUCCESS in 4m 49s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/49ed12b589da40e39bc0393ced56d833 : SUCCESS in 5m 44s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/054c06ce85064fc28ba4f712db7a1fbd : SUCCESS in 5m 45s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/017fd7a9fea042c6b8b8c2f4104b603d : FAILURE in 4m 11s