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

Build failed. https://zuul.opendev.org/t/openstack/buildset/80d92896034c461b8d78102a43440e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/dc8a00e3de2348f5b24cb38fff1ff5aa : SUCCESS in 6m 07s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/24898613624e4cf586c08e7c46a60e7a : SUCCESS in 5m 04s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/ca69505514aa44e6a1a5981818202f85 : SUCCESS in 6m 15s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ecca4a29ac3b4971862d3aa4a8a23ac5 : FAILURE in 4m 43s