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

Build failed. https://zuul.opendev.org/t/openstack/buildset/21237cb592f94e1fb36b0c9ce2164e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/c08ee9331a5c4cf8b571a6326ff0206a : SUCCESS in 5m 08s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/34234b7abf404ac2860d50a071834259 : SUCCESS in 4m 25s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/953afcbe436d44969a2042a973f5686d : SUCCESS in 4m 55s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/da27bb3ce996419d83794265e17f35d4 : FAILURE in 4m 45s