Move back undercloud upgrade job to voting in tq

Undercloud upgrade job was marked non-voting in [1] to temporary
unblock gate in tq repo.

Fix for undercloud upgrade job is release a new version of puppet-tripleo,
which was done via [2].

Moving back undercloud upgrade job to voting as fix is merged.

[1] https://review.opendev.org/c/openstack/tripleo-quickstart/+/873213
[2] https://review.opendev.org/c/openstack/releases/+/872858

Related-Bug: #2006649
Change-Id: I6e60ff9256c3c2dc8928a87f9a8d53e6f1c747b0

zuul.d/layout.yaml

@@ -17,8 +17,6 @@
         - tripleo-ci-centos-9-content-provider:
             dependencies:
               - openstack-tox-linters
-        - tripleo-ci-centos-9-undercloud-upgrade:
-            voting: false
         - tripleo-ci-centos-9-scenario007-multinode-oooq-container:
             vars:
               consumer_job: true
@@ -33,5 +31,3 @@
       jobs:
         - tripleo-tox-molecule
         - openstack-tox-linters
-        - tripleo-ci-centos-9-undercloud-upgrade:
-            voting: false