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

Build failed. https://zuul.opendev.org/t/openstack/buildset/e25b5815057e4c45b2923dc0675b80... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/10203cd4303045da8291198c48015b44 : SUCCESS in 4m 56s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/0b6f62f305c24fd7948bc31fd9a8963e : SUCCESS in 6m 23s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/305314bc5a8e4b38a6933967f1f1e175 : SUCCESS in 5m 39s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/aee0a613c26c4afabc491534d0f863c9 : FAILURE in 4m 52s