Merge tag '2.6.0' into debian/yoga

oslo.versionedobjects 2.6.0 release

meta:version: 2.6.0
meta:diff-start: -
meta:series: yoga
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: Ic32d9fb41107843c3c0f81c96dc86fba24db02eb
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>

.zuul.yaml

@@ -5,7 +5,7 @@
     templates:
       - check-requirements
       - lib-forward-testing-python3
-      - openstack-python3-xena-jobs
+      - openstack-python3-yoga-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3

releasenotes/source/index.rst

@@ -6,6 +6,7 @@
    :maxdepth: 1
 
    unreleased
+   xena
    wallaby
    victoria
    ussuri

releasenotes/source/xena.rst

+=========================
+Xena Series Release Notes
+=========================
+
+.. release-notes::
+   :branch: stable/xena

setup.cfg

@@ -18,6 +18,7 @@ classifier =
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython