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

Build failed. https://zuul.opendev.org/t/openstack/buildset/f5f198a3af79479bb67f28b2a0b47e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/b85ccebf48244ee4a0cf3fb50293d985 : SUCCESS in 4m 52s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/55ad116622b049238b38a570831b00a6 : SUCCESS in 5m 44s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c355feb1ead14ce194aaa556b81236ff : SUCCESS in 5m 22s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/164662181baa4cbfbdabcd6909ade998 : FAILURE in 5m 01s