update constraint for openstack-release-test to new release 8.0.0

meta: version: 8.0.0
meta: team: Release Management
meta: diff-start: -
meta: series: epoxy
meta: branch: master
meta: release-type: release
meta: pypi: no
meta: first: yes
meta: release:Author: Jeremy Stanley <fungi@yuggoth.org>
meta: release:Commit: Jeremy Stanley <fungi@yuggoth.org>
meta: release:Change-Id: I626c3e3c5905b5b6447841fe05fd2d3ad4934450
meta: release:Code-Review+2: Dr. Jens Harbott <frickler@offenerstapel.de>
meta: release:Workflow+1: Dr. Jens Harbott <frickler@offenerstapel.de>
Change-Id: I068658c3b9d9312955f62bb828108621499a10ef

Author: OpenStack Proposal Bot

upper-constraints.txt

@@ -192,7 +192,7 @@ cryptography===44.0.0
 httpcore===1.0.7
 URLObject===2.4.3
 psycopg2-binary===2.9.10
-openstack-release-test===7.0.0
+openstack-release-test===8.0.0
 pycryptodomex===3.21.0
 requests-mock===1.12.1
 os-apply-config===14.0.0