Make horizon-integration-tests job voting again

This patch makes "horizon-integration-tests" job voting
again. It was changed to non-voting so that patch that
update Xstatic-jQuery upper bound, update cirros version
for the horizon-integration job and a few other changes
which are required to fix the horizon-integration can get merged.

The patch [1] is already merged and the upper bound in
openStack/requirement also got updated[2]. So let's make
horizon-integration job voting again.

[1] https://review.opendev.org/c/openstack/horizon/+/887548
[2] https://review.opendev.org/c/openstack/requirements/+/887933

Change-Id: I0059c2cd47e6b540306337caa3e0f826f3b755a9

.zuul.d/project.yaml

@@ -12,8 +12,7 @@
     check:
       jobs:
         - horizon-selenium-headless
-        - horizon-integration-tests:
-            voting: false
+        - horizon-integration-tests
         - horizon-dsvm-tempest-plugin
         - horizon-tox-bandit-baseline
         - horizon-tempest-plugin-ipv6
@@ -21,8 +20,7 @@
       jobs:
         - horizon-dsvm-tempest-plugin
         - horizon-selenium-headless
-        - horizon-integration-tests:
-            voting: false
+        - horizon-integration-tests
         - horizon-tempest-plugin-ipv6
     experimental:
       jobs: