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

Build failed. https://zuul.opendev.org/t/openstack/buildset/bee0488fe43246b08cb146874271f4... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/bc68acd38b1c41f38f7b915bfdd46256 : SUCCESS in 4m 45s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/a1a711b6d6934fb39ff93010018022ce : SUCCESS in 4m 40s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/3f1870acad22423a9d563a0a3297f1d1 : SUCCESS in 4m 41s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/3dda5927d82248ada7b89e5d18d4a0c6 : FAILURE in 4m 28s