[kolla] Wallaby releases available

Hi, I'm pleased to announce the availability of the first Wallaby releases for all Kolla deliverables: * kolla 12.0.0 (https://docs.openstack.org/releasenotes/kolla/wallaby.html#relnotes-12-0-0-s...) * kolla-ansible 12.0.0 (https://docs.openstack.org/releasenotes/kolla-ansible/wallaby.html#relnotes-...) * kayobe 10.0.0 (https://docs.openstack.org/releasenotes/kayobe/wallaby.html#relnotes-10-0-0-...) A lot of hard work was involved in these releases which add support for two new OS versions: CentOS Stream and Debian Bullseye. Many thanks to everyone who contributed to these releases. And now onto Xena! Thanks, Mark