[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/1a8499f9e8014208bf9e41ca348e8b... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6781631bb8e44f7bb3325a58a4b4525f : TIMED_OUT in 31m 19s - openstack-tox-py38 https://zuul.opendev.org/t/openstack/build/8e28ea704ab34462b724508e7b8f687a : TIMED_OUT in 40m 43s - openstack-tox-py39 https://zuul.opendev.org/t/openstack/build/53d079e01e9a4d818427373e0c32595b : TIMED_OUT in 41m 00s