oslo.messaging 12.6.0 release

meta:version: 12.6.0
meta:diff-start: -
meta:series: wallaby
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Daniel Bengtsson <dbengt@redhat.com>
meta:release:Commit: Daniel Bengtsson <dbengt@redhat.com>
meta:release:Change-Id: Ie486f233a40775262b83a597c42899ad8420cc85
meta:release:Code-Review+2: Hervé Beraud <hberaud@redhat.com>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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