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

Build failed. https://zuul.opendev.org/t/openstack/buildset/b4d936f62419403aab2d90c429fd09... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a4f0a5af0ad54d68a92d5a2a56e56084 : SUCCESS in 4m 44s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/1b6d27b94b85449baa43304f983ab02e : SUCCESS in 4m 59s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/cdeab52d99ed4ae88036d7b7b1ddd383 : SUCCESS in 4m 10s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/b14cf3861f094c6fac2cc05140533902 : FAILURE in 3m 43s