Revert "Build groovy-provider against gerrit stable-3.6"

This reverts commit c45dd3eaac2ef906ddb7019a1dff45784f9d92ef.

Reason for revert: Isn't working on stable-3.6

Change-Id: If30ba0e5275c3d3ef5aa06b83ea5ed3b85dc31b2
diff --git a/jenkins/gerrit-bazel-plugin-groovy-provider.yaml b/jenkins/gerrit-bazel-plugin-groovy-provider.yaml
index e61b9b1..76c6fa3 100644
--- a/jenkins/gerrit-bazel-plugin-groovy-provider.yaml
+++ b/jenkins/gerrit-bazel-plugin-groovy-provider.yaml
@@ -8,7 +8,6 @@
           branch:
             - master
           gerrit-branch:
-            - stable-3.6
             - stable-3.5
             - stable-3.4
             - stable-3.3