[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/fa40897c53c24441afd8a71150759a... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a91a7475739f4d4d842568e60efe167c : SUCCESS in 6m 34s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/9258eef3e5514f2fba4627b7106ca113 : SUCCESS in 6m 28s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d5f14fd78a3c4a42a477ace599c3f949 : SUCCESS in 2m 58s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5939b18197e64721910e8199d99cd523 : FAILURE in 3m 45s