Build account plugin on stable-3.4 branch

Change-Id: If3459d411850ac3bb57061b1200d356bfd7ddd46
diff --git a/jenkins/gerrit-bazel-plugin-account.yaml b/jenkins/gerrit-bazel-plugin-account.yaml
index 5f6cca1..8ca3f70 100644
--- a/jenkins/gerrit-bazel-plugin-account.yaml
+++ b/jenkins/gerrit-bazel-plugin-account.yaml
@@ -41,6 +41,7 @@
       - 'plugin-account-bazel-{branch}':
           branch:
             - master
+            - stable-3.4
             - stable-3.3
             - stable-3.2
             - stable-3.1