Build Owner plugin on stable 3.3

Change-Id: Ie0009f44c329e436a91fa069c1067834bb96cfea
diff --git a/jenkins/gerrit-bazel-plugin-owners.yaml b/jenkins/gerrit-bazel-plugin-owners.yaml
index 19ecf47..83b0e0d 100644
--- a/jenkins/gerrit-bazel-plugin-owners.yaml
+++ b/jenkins/gerrit-bazel-plugin-owners.yaml
@@ -66,6 +66,7 @@
           gerrit-branch:
             - master
             - stable-3.2
+            - stable-3.3
       - 'plugin-owners-bazel-{branch}':
           targets: 'plugins/owners plugins/owners-autoassign'
           branch: