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

Build failed. https://zuul.opendev.org/t/openstack/buildset/604c33ae18614a0486e060adf10458... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ce7248bb3d644c1d9beade4ac378f3c9 : SUCCESS in 4m 31s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/54aec629167f4b1ca617e1c0683f1163 : SUCCESS in 4m 40s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/66be2bfb921b43a4bfc282df7fd03cce : SUCCESS in 5m 38s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/af331797a4a640f78e50524a71357959 : FAILURE in 5m 56s