[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/19c43cfb8808467abd525febde19e4... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/fbc02eecc53e4cae9560fed48adaa955 : SUCCESS in 5m 10s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/4d9b82afb1724696a9b78321c082822b : SUCCESS in 4m 03s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0f0061a5f16c475a80940293b81c569b : SUCCESS in 4m 03s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/75756e6a65934bf3b55727dccd3f714e : FAILURE in 3m 49s