Build oauth against gerrit stable-3.6

Bug: Issue 15831
Change-Id: I937822448a728f5ad8a345ed7d161979e8426fe7
diff --git a/jenkins/gerrit-bazel-plugin-oauth.yaml b/jenkins/gerrit-bazel-plugin-oauth.yaml
index 87cbc60..1be4af9 100644
--- a/jenkins/gerrit-bazel-plugin-oauth.yaml
+++ b/jenkins/gerrit-bazel-plugin-oauth.yaml
@@ -11,3 +11,4 @@
           gerrit-branch:
             - master
             - stable-3.5
+            - stable-3.6