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

Build failed. https://zuul.opendev.org/t/openstack/buildset/409bb5aac21249c4a018e366a42cae... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/7c6359b979be469f8407e4d8e0c26ef2 : SUCCESS in 4m 55s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/bc9ada30e7ba4951b4324c9e0593f04d : SUCCESS in 5m 20s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0f453e415ca04643b7b67265d701e752 : SUCCESS in 4m 32s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ec95f8d56f034f17b3c6a780db6be447 : FAILURE in 5m 10s