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

Build failed. https://zuul.opendev.org/t/openstack/buildset/61e6013d73b6438db9bddd92e9b8d9... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/4d1e2b6793e44c3d84f4a8bb32aa39e9 : SUCCESS in 7m 05s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/a85ddea1be9f4d8cb8a93370f94d63b1 : SUCCESS in 6m 57s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/12125511b5fd4205bf510ef14d2be768 : SUCCESS in 6m 11s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/3ff6756626a14ea69c549f6d988abe6f : FAILURE in 5m 03s