Build owners plugin on stable-3.4 branch

Also build the plugin on their own stable-3.2 and stable-3.3 branches.

Change-Id: Id0b0f70444002ccda5fd087578487d3fbfb8916f
diff --git a/jenkins/gerrit-bazel-plugin-owners.yaml b/jenkins/gerrit-bazel-plugin-owners.yaml
index 83b0e0d..09b3f38 100644
--- a/jenkins/gerrit-bazel-plugin-owners.yaml
+++ b/jenkins/gerrit-bazel-plugin-owners.yaml
@@ -65,10 +65,11 @@
             - master
           gerrit-branch:
             - master
-            - stable-3.2
-            - stable-3.3
+            - stable-3.4
       - 'plugin-owners-bazel-{branch}':
           targets: 'plugins/owners plugins/owners-autoassign'
           branch:
+            - stable-3.3
+            - stable-3.2
             - stable-3.1
             - stable-2.16