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

Build failed. https://zuul.opendev.org/t/openstack/buildset/e648a0ce67a341b8a9e12b580a049e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/5c3c58d3411e4ab3abcdaa804022621e : SUCCESS in 3m 11s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/81e3b838b7814791af75fd2695f58304 : SUCCESS in 6m 01s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/13f8c178053040f88fddde3b6fbce0c4 : SUCCESS in 4m 24s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/31e2de0726854c0daa4f57541b37fd7d : FAILURE in 4m 32s