oslo.config 8.6.0 release

meta:version: 8.6.0
meta:diff-start: -
meta:series: xena
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Daniel Bengtsson <dbengt@redhat.com>
meta:release:Commit: Daniel Bengtsson <dbengt@redhat.com>
meta:release:Change-Id: I47e48b9f1a4f5b3f8f3525b0aed57c4db441c6f3
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta:release:Workflow+1: Elod Illes <elod.illes@est.tech>