Mark rolling-upgrade job non-voting

Upstream CPython broke our HTTP parsing; while we can fix our own
HttpProtocol, previous tags won't have the fix (naturally).

See also: 4abab6b603

Change-Id: Ibe67b1a485350967e37809ba8575a33eba56ee97
Related-Change: https://review.opendev.org/c/openstack/swift/+/863441

.zuul.yaml

@@ -749,6 +749,7 @@
               - ^doc/(requirements.txt|(saio|s3api|source)/.*)$
         - swift-multinode-rolling-upgrade:
             irrelevant-files: *functest-irrelevant-files
+            voting: false
         - tempest-integrated-object-storage:
             irrelevant-files: &tempest-irrelevant-files
               - ^(api-ref|doc|releasenotes)/.*$
@@ -793,8 +794,6 @@
             irrelevant-files: *unittest-irrelevant-files
         - openstack-tox-pep8:
             irrelevant-files: *pep8-irrelevant-files
-        - swift-multinode-rolling-upgrade:
-            irrelevant-files: *functest-irrelevant-files
         - tempest-integrated-object-storage:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-ipv6-only: