update constraint for python-designateclient to new release 6.4.0

meta: version: 6.4.0
meta: team: designate
meta: diff-start: -
meta: series: gazpacho
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: Iaf0534f165ec28b14bf2b0f0a9f4b3dd48339cf7
meta: release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta: release:Code-Review+1: Omer Schwartz <oschwart@redhat.com>
meta: release:Workflow+1: Elod Illes <elod.illes@est.tech>
Change-Id: Idf5d89e0f58903309c532e69282c75acb59e0493
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

@@ -468,7 +468,7 @@ repoze.lru===0.7
 rfc3986===2.0.0
 tenacity===9.1.4
 invoke===2.2.1
-python-designateclient===6.3.0
+python-designateclient===6.4.0
 pytest-cov===4.1.0
 reactivex===4.1.0
 Paste===3.10.1