oslo.db 4.12.0 release

meta:version: 4.12.0
meta:diff-start: -
meta:series: newton
meta:release-type: release
meta:announce: openstack-dev@lists.openstack.org
meta:pypi: yes
meta:first: no
meta:release:Author: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Commit: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Change-Id: Iaefcbfb62c27eba285f5a5808a5e18922bed9892
meta:release:Code-Review+1: ChangBo Guo(gcb) <glongwave@gmail.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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