Build gerrit-bsl-license plugin on stable-3.14

Change-Id: Iaa05f98def3ef9411af691229afe31011e979a00

jenkins/gerrit-bazel-plugin-gerrit-bsl-license.yaml

diff --git a/jenkins/gerrit-bazel-plugin-gerrit-bsl-license.yaml b/jenkins/gerrit-bazel-plugin-gerrit-bsl-license.yaml
index 5fb46b5..cb8ee04 100644
--- a/jenkins/gerrit-bazel-plugin-gerrit-bsl-license.yaml
+++ b/jenkins/gerrit-bazel-plugin-gerrit-bsl-license.yaml
@@ -6,4 +6,5 @@
       - 'plugin-{name}-gh-bazel-{branch}':
           branch:
             - master
+            - stable-3.14
       - 'plugin-{name}-verifier-gh'