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

Build failed. https://zuul.opendev.org/t/openstack/buildset/61cb64cd523d462eba7c17cd300337... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/f921fa7506d1428baf0c1e44a2c16707 : SUCCESS in 4m 32s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/36217ccfd1ca4bdcb52aa86e05944a23 : SUCCESS in 4m 22s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c31df14e138c483b9939580f81573170 : FAILURE in 4m 12s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/32c4d9e4b96a44b3ba7691eeea1b0d1d : SUCCESS in 4m 27s