Build events-aws-kinesis plugin on stable-3.13

Change-Id: Ic638503ed02fa5a8766c6ca3e2147bc011096a12
diff --git a/jenkins/gerrit-bazel-plugin-events-aws-kinesis.yaml b/jenkins/gerrit-bazel-plugin-events-aws-kinesis.yaml
index 191fd2a..b3aab8c 100644
--- a/jenkins/gerrit-bazel-plugin-events-aws-kinesis.yaml
+++ b/jenkins/gerrit-bazel-plugin-events-aws-kinesis.yaml
@@ -12,5 +12,6 @@
       - 'plugin-{name}-gh-bazel-{branch}':
           branch:
             - master
+            - stable-3.13
       - 'plugin-{name}-verifier'
       - 'plugin-{name}-verifier-gh'