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

Build failed. https://zuul.opendev.org/t/openstack/buildset/b33f8d13a49c493b9ce807961e158f... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/5f25fb37d2de4ed59d790232b37da160 : SUCCESS in 4m 54s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/6248ab39d93144909259803040530219 : SUCCESS in 6m 07s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/bf0d544725a9467fac5addae101286fb : SUCCESS in 4m 59s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/dc331e6255b945b4a23d1c46882e2213 : FAILURE in 6m 30s