oslo.concurrency 3.20.0 release

meta:version: 3.20.0
meta:diff-start: -
meta:series: pike
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: ChangBo Guo(gcb) <eric.guo@easystack.cn>
meta:release:Commit: ChangBo Guo(gcb) <eric.guo@easystack.cn>
meta:release:Change-Id: I61ad5e7f62f7aa459a8c163bda74597b580c4851
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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