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

Build failed. https://zuul.opendev.org/t/openstack/buildset/443d11bd47874436ab4eeff8a410b1... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/43a48422ce324e068ad7d7151850f462 : FAILURE in 4m 47s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b32b159314a448ebac34ba081c5dc430 : FAILURE in 6m 10s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/1bc27c6a2dd4432888e62686ae28036c : FAILURE in 5m 01s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/01eb21ed1b9e4256b8026cda524cec97 : FAILURE in 5m 18s