oslo.db 4.13.0 release

meta:version: 4.13.0
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: Davanum Srinivas <davanum@gmail.com>
meta:release:Change-Id: I3c4738cb6fc0baf1e15c9bc17864a6d79a4a786b
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