Create 3.13 build for cached-refdb enterprise plugin

Change-Id: Icf461d462f9273599603de2f79e9ac730ae39215
diff --git a/jenkins/gerrit-bazel-module-cached-refdb.yaml b/jenkins/gerrit-bazel-module-cached-refdb.yaml
index 805e9e8..ca99f08 100644
--- a/jenkins/gerrit-bazel-module-cached-refdb.yaml
+++ b/jenkins/gerrit-bazel-module-cached-refdb.yaml
@@ -10,5 +10,11 @@
       - 'module-{name}-gh-bazel-{branch}':
           branch:
             - master
+
+      - 'plugin-{name}-gh-bazel-{branch}-{gerrit-branch}':
+          branch:
+            - master
+          gerrit-branch:
+            - stable-3.13
       - 'module-{name}-verifier'
       - 'module-{name}-verifier-gh'