[Openstack-stable-maint] Stable check of openstack/oslo.serialization for ref refs/heads/stable/zed failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/f4ed709a664448b7b41ec68b3b1afc... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/4d25ccec82d14b21bbd9076e0ed22331 : TIMED_OUT in 30m 51s - openstack-tox-py38 https://zuul.opendev.org/t/openstack/build/00203507461d460c9ae237df7f7afae0 : TIMED_OUT in 40m 49s - openstack-tox-py39 https://zuul.opendev.org/t/openstack/build/3305a430f4e44645b37ff974584f611a : TIMED_OUT in 40m 51s