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

Build failed. https://zuul.opendev.org/t/openstack/buildset/a398e597d4614e6b86b34a27baf1c1... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6df32f308e3d43a38721eaf4e188f141 : TIMED_OUT in 30m 55s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/58cb9f3f9ff8442288e31b050bbf8705 : SUCCESS in 2m 59s - openstack-tox-py38 https://zuul.opendev.org/t/openstack/build/529aeead135f4c928f7dad63978e6c56 : TIMED_OUT in 40m 49s