Adapt tests to Gerrit 3.6

Change-Id: If86429204bc6870a80fd9609b69b5898d0571bff
diff --git a/tests/helm-charts/gerrit/test_chart_gerrit_plugins.py b/tests/helm-charts/gerrit/test_chart_gerrit_plugins.py
index 9e8c58c..4f57124 100644
--- a/tests/helm-charts/gerrit/test_chart_gerrit_plugins.py
+++ b/tests/helm-charts/gerrit/test_chart_gerrit_plugins.py
@@ -23,8 +23,8 @@
 
 from kubernetes import client
 
-PLUGINS = ["reviewers", "account"]
-GERRIT_VERSION = "3.5"
+PLUGINS = ["code-owners", "account"]
+GERRIT_VERSION = "3.6"
 
 
 @pytest.fixture(scope="module")