oslo.concurrency 3.28.1 release

meta:version: 3.28.1
meta:diff-start: 3.27.0
meta:series: stein
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Doug Hellmann <doug@doughellmann.com>
meta:release:Commit: Doug Hellmann <doug@doughellmann.com>
meta:release:Change-Id: Iaea87ebe23bcad27d4422f3c477bf2fa37cf5bc5
meta:release:Code-Review+1: Alex Schultz <aschultz@redhat.com>
meta:release:Code-Review+1: Julia Kreger <juliaashleykreger@gmail.com>
meta:release:Code-Review+1: Sergii Golovatiuk <sgolovat@redhat.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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