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

Build failed. https://zuul.opendev.org/t/openstack/buildset/9f49ea1e20e44dbfb45935b151a12e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/eb9b9d74746344d5b38ff99c3d017f6c : SUCCESS in 5m 22s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/f8763e75a9b542cbadb3f1a2c57e1574 : SUCCESS in 5m 45s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c8f4750562b4470496c4f5c143334b1d : SUCCESS in 3m 50s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/11c64158ff3144cfaf162226dc61df13 : FAILURE in 7m 31s