Build pull-replication plugin on stable-3.13

Change-Id: I08d1bd5b65b03bbcc996e83167d79fb5846a053f
diff --git a/jenkins/gerrit-bazel-plugin-pull-replication.yaml b/jenkins/gerrit-bazel-plugin-pull-replication.yaml
index 355d601..0b6e575 100644
--- a/jenkins/gerrit-bazel-plugin-pull-replication.yaml
+++ b/jenkins/gerrit-bazel-plugin-pull-replication.yaml
@@ -13,5 +13,6 @@
       - 'plugin-{name}-gh-bazel-{branch}':
           branch:
             - master
+            - stable-3.13
       - 'plugin-{name}-verifier'
       - 'plugin-{name}-verifier-gh'