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

Build failed. https://zuul.opendev.org/t/openstack/buildset/a55d3806343441d9b581ab00064aa3... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/2df97aff3a70400195e9f6f91c414e14 : SUCCESS in 5m 04s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b6548e5e3daf4bb1af790babc46c19c7 : SUCCESS in 5m 15s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/515943b35c7d4af99e543c32f79c4057 : SUCCESS in 4m 57s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5fe8186b3d834defb4fcc94bd8309378 : FAILURE in 4m 37s