oslo.messaging 5.12.0 release

meta:version: 5.12.0
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:announce: openstack-dev@lists.openstack.org
meta:pypi: yes
meta:first: no
meta:release:Author: Mehdi Abaakouk <sileht@sileht.net>
meta:release:Commit: Mehdi Abaakouk <sileht@sileht.net>
meta:release:Change-Id: I0fbe93dc57c6803609cd33dd9ce7a509738e3aa9
meta:release:Code-Review+2: Davanum Srinivas (dims) <davanum@gmail.com>
meta:release:Workflow+1: Davanum Srinivas (dims) <davanum@gmail.com>
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