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

Build failed. https://zuul.opendev.org/t/openstack/buildset/5f63a501fc2743f08bfc67cec513e4... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/995534f886154cef853d930663b0e607 : SUCCESS in 5m 04s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/36e6f3f5b5b54ffcb61307ff68acf2c6 : SUCCESS in 4m 38s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/cd6d195263c14f9db80f400837ec1726 : SUCCESS in 6m 11s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/3fee76cfe5b94ba083e87860fc1365e2 : FAILURE in 5m 32s