Build quota plugin on stable-3.4 branch

Change-Id: Id1d93b5a750d8a9c2ed9ff27cb91c7feed266735
diff --git a/jenkins/gerrit-bazel-plugin-quota.yaml b/jenkins/gerrit-bazel-plugin-quota.yaml
index ec717f4..2635bc8 100644
--- a/jenkins/gerrit-bazel-plugin-quota.yaml
+++ b/jenkins/gerrit-bazel-plugin-quota.yaml
@@ -6,6 +6,7 @@
             - master
           gerrit-branch:
             - master
+            - stable-3.4
             - stable-3.3
       - 'plugin-{name}-bazel-{branch}':
           branch: