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

Build failed. https://zuul.opendev.org/t/openstack/buildset/cda6e0e93c5a498498fc88aa680201... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a8510591b8b246b7ab42ea754c217c8a : SUCCESS in 5m 01s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/30fac098c3f64e59baf28a4d8923223a : SUCCESS in 5m 07s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/3b327314d4e64e239230acb2084f1390 : SUCCESS in 4m 37s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/231a91fe99c646df91da92097ab8578f : FAILURE in 3m 57s