update constraint for python-mistralclient to new release 6.0.0

meta: version: 6.0.0
meta: team: mistral
meta: diff-start: -
meta: series: flamingo
meta: branch: master
meta: release-type: release
meta: pypi: yes
meta: first: yes
meta: release:Author: Elod Illes <elod.illes@est.tech>
meta: release:Commit: Elod Illes <elod.illes@est.tech>
meta: release:Change-Id: I8b5b43ba3e613c4cd10534cbf8d66537a1952e9b
meta: release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta: release:Workflow+1: Thierry Carrez <thierry@openstack.org>
meta: release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
Change-Id: I652d544164128dbe2e8ac3dd14beaad4431b0dee
Signed-off-by: OpenStack Proposal Bot <openstack-infra@lists.openstack.org>
Generated-By: openstack/project-config:roles/copy-release-tools-scripts/files/release-tools/update_constraints.sh

Author: OpenStack Proposal Bot

upper-constraints.txt

@@ -51,7 +51,7 @@ Pint===0.23;python_version=='3.9'
 Pint===0.24.4;python_version>='3.10'
 oslo.i18n===6.6.0
 jsonpath-rw-ext===1.2.2
-python-mistralclient===5.4.0
+python-mistralclient===6.0.0
 oslo.context===6.1.0
 rcssmin===1.1.2
 pycadf===4.0.1