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

Build failed. https://zuul.opendev.org/t/openstack/buildset/bd23ede87af948569c1e486a274c27... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a936ada0be414fd7b037a2175f203b41 : FAILURE in 5m 21s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/f913de1cd2cb4195931ad93fb6c18eec : FAILURE in 3m 38s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/b3ffbfebbbd74c52a7e64297f8092887 : FAILURE in 6m 45s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/128d0d7bb6904d37b38b6f16833bf483 : FAILURE in 4m 40s