Build uploadvalidator for Gerrit 2.14

Change-Id: I8a9a2db438e61f073b78eb6b2199995d620366ff
diff --git a/jenkins/gerrit-buck-bazel-plugin-uploadvalidator.yaml b/jenkins/gerrit-buck-bazel-plugin-uploadvalidator.yaml
index c52adf8..927dc4f 100644
--- a/jenkins/gerrit-buck-bazel-plugin-uploadvalidator.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-uploadvalidator.yaml
@@ -10,4 +10,5 @@
       - 'plugin-{name}-bazel-{branch}':
           branch:
             - master
+            - stable-2.14