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

Build failed. https://zuul.opendev.org/t/openstack/buildset/70ead8dbe7d345c58882bbb7de7881... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/d47ea51613ec4b099cd3494fbdc6a3c2 : SUCCESS in 5m 09s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/d65c551106b84cd48b435790a663cf99 : SUCCESS in 3m 23s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/f9c9ed9a3e394dbbb23980b76fc6fcbc : SUCCESS in 3m 53s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ba59844416c244dc8ca3b028ae629174 : FAILURE in 3m 29s