[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/6eae8bcd089f4f8bbcebac9dbbebf21e : SUCCESS in 7m 19s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/24709de9e4c646e1b89a746cc2be2e09 : FAILURE in 5m 59s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/745d6d59a83c44e9a495ee600961eb75 : FAILURE in 7m 03s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1e98cbe39bfd4d8da722113600136275 : FAILURE in 7m 36s