Build oauth master against Gerrit stable-3.7

Change-Id: If76fe5b85b30247d7c5e2d173a189739b2812fc5
diff --git a/jenkins/gerrit-bazel-plugin-oauth.yaml b/jenkins/gerrit-bazel-plugin-oauth.yaml
index 93d4d64..2fa2b9e 100644
--- a/jenkins/gerrit-bazel-plugin-oauth.yaml
+++ b/jenkins/gerrit-bazel-plugin-oauth.yaml
@@ -9,5 +9,6 @@
             - master
           gerrit-branch:
             - master
+            - stable-3.7
             - stable-3.6
             - stable-3.5