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

Build failed. https://zuul.opendev.org/t/openstack/buildset/2f4c18936d6340698bb10b0cb0530b... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/36d9c87076cb455aafff52954999b9f5 : SUCCESS in 4m 24s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/cf2d02f338784a499ebab95defca11f6 : SUCCESS in 4m 02s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d21a98290ed1466d94cf115cb92d93ca : SUCCESS in 4m 26s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f23f19ce21d3481bb3f963308a55d721 : FAILURE in 3m 52s