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

Build failed. https://zuul.opendev.org/t/openstack/buildset/39f23260119a421186dbe6eb4a7ec0... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/06f1699109ac421d80e3eaab4fe6102c : SUCCESS in 4m 55s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/509e8a51af4b410ca6bcca594bd1a74b : SUCCESS in 5m 07s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0fb1487d4ee94fe1b27062e8f37cc185 : SUCCESS in 5m 19s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8c62fdaed1b143f6a330d0599b8d08cd : FAILURE in 4m 38s