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

Build failed. https://zuul.opendev.org/t/openstack/buildset/49f6d2a3362b4260847acf64df1227... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ce2a9b0f664048dd9fe81447ce338a0b : SUCCESS in 5m 37s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/e3502be787064f40a00606b456c9d369 : SUCCESS in 5m 41s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/2c2a85f42b3b47f2a02ddb98f35f094a : SUCCESS in 4m 40s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5ffda4d469dc4bd28abec66e5211a7a0 : FAILURE in 4m 16s