Fix mixed version failure

Author: ansd

deps/rabbitmq_auth_backend_oauth2/test/system_SUITE.erl

@@ -90,16 +90,17 @@ groups() ->
 
 init_per_suite(Config) ->
     rabbit_ct_helpers:log_environment(),
-    rabbit_ct_helpers:run_setup_steps(Config,
-      rabbit_ct_broker_helpers:setup_steps() ++ [
-        fun preconfigure_node/1,
-        fun preconfigure_token/1
-      ]).
+    Config1 = rabbit_ct_helpers:run_setup_steps(
+                Config,
+                rabbit_ct_broker_helpers:setup_steps() ++
+                [fun preconfigure_node/1,
+                 fun preconfigure_token/1]),
+    ok = rabbit_ct_broker_helpers:enable_feature_flag(Config1, mqtt_v5),
+    Config1.
 
 end_per_suite(Config) ->
     rabbit_ct_helpers:run_teardown_steps(Config, rabbit_ct_broker_helpers:teardown_steps()).
 
-
 init_per_group(_Group, Config) ->
     %% The broker is managed by {init,end}_per_testcase().
     lists:foreach(fun(Value) ->