oslo.serialization 2.28.0 release

meta:version: 2.28.0
meta:diff-start: -
meta:series: stein
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Ben Nemec <bnemec@redhat.com>
meta:release:Commit: Ben Nemec <bnemec@redhat.com>
meta:release:Change-Id: I56aa9816410965b15a58ae330853a2c4f4af830b
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@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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