update constraint for python-novaclient to new release 18.12.0

meta: version: 18.12.0
meta: team: nova
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: I508f24b011c4e89a06c342103d67d3e17264f399
meta: release:Code-Review+1: ribaudr <rene.ribaud@gmail.com>
meta: release:Workflow+1: Elod Illes <elod.illes@est.tech>
meta: release:Code-Review+2: Elod Illes <elod.illes@est.tech>
Change-Id: I9f7071abf228f9d672df84ab3fcfecf79a58b280
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

@@ -193,7 +193,7 @@ sysv_ipc===1.2.0
 sphinxcontrib-jsmath===1.0.1
 django_compressor===4.6.0
 awscurl===0.36
-python-novaclient===18.11.0
+python-novaclient===18.12.0
 pact===1.12.0
 bcrypt===5.0.0
 exceptiongroup===1.3.1