update constraint for python-openstackclient to new release 8.1.0

Kept python-openstackclient version 8.0.0 constraint for
Python 3.9

meta: version: 8.1.0
meta: team: OpenStackSDK
meta: diff-start: -
meta: series: flamingo
meta: branch: master
meta: release-type: release
meta: pypi: yes
meta: first: no
meta: release:Author: Stephen Finucane <sfinucan@redhat.com>
meta: release:Commit: Stephen Finucane <sfinucan@redhat.com>
meta: release:Change-Id: I829c3dc9cb1fe1a84098c202b6d8f302395789f6
meta: release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta: release:Code-Review+1: Artem Goncharov <artem.goncharov@gmail.com>
meta: release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta: release:Workflow+1: Elod Illes <elod.illes@est.tech>
Change-Id: I7bfd662862bde6ef2fa76a80c64f258b898be6b9

Author: OpenStack Proposal Bot

upper-constraints.txt

@@ -468,7 +468,8 @@ python-ironicclient===5.11.0
 babel===2.17.0
 XStatic===1.0.3
 XStatic-Angular-FileUpload===12.2.13.0
-python-openstackclient===8.0.0
+python-openstackclient===8.0.0;python_version=='3.9'
+python-openstackclient===8.1.0;python_version>='3.10'
 pyzmq===26.4.0
 oslo.db===17.2.1
 simplegeneric===0.8.1