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

Build failed. https://zuul.opendev.org/t/openstack/buildset/b187d9b470fb448285ba7a35cece49... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ba31033df5bd42ffacc09f8dcb02fc23 : SUCCESS in 8m 06s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/bea52d03610d4b1c96f2858dfd2d6dee : SUCCESS in 7m 28s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/5e25df7f50424fd08941739679ce73f1 : SUCCESS in 6m 27s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/46e4bc4988244898a6b7fa26b2be7625 : FAILURE in 8m 29s