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

Build failed. https://zuul.opendev.org/t/openstack/buildset/156453fa728a432f8ac120ed1efa26... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/4995eed1c7254fdb86d6aad165d1cfb1 : SUCCESS in 4m 31s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/673f7471b0ee434ea89242f6c0a861b8 : SUCCESS in 4m 45s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c9faf155b1ae490cad3bee1cff794925 : SUCCESS in 4m 19s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/7d5a85d5ac884bf3b40180aa8fa58d81 : FAILURE in 4m 34s