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

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6fa47d5c6cae4a9198804ef62018750c : SUCCESS in 8m 11s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/5c7cba1c0a694cfe8d0bae7650a55343 : FAILURE in 6m 02s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/8bcaf5940a1d4833864a9cbdc96d703f : FAILURE in 8m 25s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d1b6bbd2d37d412fbad9a488a0cea718 : FAILURE in 7m 40s