cliff 2.12.0 release

meta:version: 2.12.0
meta:diff-start: -
meta:series: rocky
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Doug Hellmann <doug@doughellmann.com>
meta:release:Commit: Doug Hellmann <doug@doughellmann.com>
meta:release:Change-Id: I659f10f434f58a8c23f31892b099b6111eb64af2
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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