[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/61075f0e845241edba182596fc168d... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/5c422933b15d4733892566684ab4b3d2 : SUCCESS in 4m 49s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/0cb7ae492d2c44fea393c4f038226466 : SUCCESS in 4m 25s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/65e06ee85e2d45cbb9cdc8f0b3171e8f : SUCCESS in 4m 31s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f0609ba3bc794f17900803cc2472a0cb : FAILURE in 4m 15s