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

Build failed. https://zuul.opendev.org/t/openstack/buildset/4ba728a6a1d14829b870f5fcab6201... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/11216272d85b4610b152aa32dac71948 : SUCCESS in 5m 26s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/f04a65726f0d4224b3324bd5d2411f80 : SUCCESS in 5m 03s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/775092a2048640b89582c9eeca5b6eba : SUCCESS in 4m 50s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/16b834fc71e441dcb44935d7c40fdfff : FAILURE in 4m 39s