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

Build failed. https://zuul.opendev.org/t/openstack/buildset/6f9600aa73ce4dbfb76fa6574af8d6... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/da1eb9fd79604963912484469347a6d0 : SUCCESS in 4m 46s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/4562afd3ae414f77abad9cbd2879b2b2 : SUCCESS in 4m 49s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/3cfc4459e227453bbe16bba6576705ed : SUCCESS in 4m 55s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/eefc876574e44c9cab9c7083d349390b : FAILURE in 6m 02s