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

Build failed. https://zuul.opendev.org/t/openstack/buildset/03e665a154cd49faa46e163812b6d0... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/7fbff2feff03486495120dd3a8dd782e : SUCCESS in 4m 25s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/63babc85d062457f840e6706b45d780c : SUCCESS in 4m 38s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/04a6604d583e4646a0c3c6cd378c8c03 : SUCCESS in 4m 22s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/edbf9db81cd2484a8252b850339998a8 : FAILURE in 4m 32s