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

Build failed. https://zuul.opendev.org/t/openstack/buildset/fb8ad927954342be8597eed442a92a... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/5224ca63f03040b0b7ed72097be73402 : SUCCESS in 6m 27s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/0ebc7299ffb9448c965dc4b0f8606976 : SUCCESS in 6m 07s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/6b0507935b29498ea6ef2dea21811f6d : SUCCESS in 4m 30s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/909e643c181442ab8fc9509a74416af7 : FAILURE in 5m 23s