Build 'audit-sl4j' master against Gerrit 'stable-3.7' branch

Change-Id: I1f34a1048c128a4d22bb038fe984c90dea3ca17b
diff --git a/jenkins/gerrit-bazel-plugin-audit-sl4j.yaml b/jenkins/gerrit-bazel-plugin-audit-sl4j.yaml
index 61d0872..869791c 100644
--- a/jenkins/gerrit-bazel-plugin-audit-sl4j.yaml
+++ b/jenkins/gerrit-bazel-plugin-audit-sl4j.yaml
@@ -8,6 +8,7 @@
           branch:
             - master
           gerrit-branch:
+            - stable-3.7
             - stable-3.6
             - stable-3.5
             - stable-3.4