Merge pull request #9885 from rabbitmq/mergify/bp/v3.12.x/pr-9884

Avoid warning of unhandled message (backport #9884)

Author: michaelklishin

deps/rabbitmq_mqtt/src/rabbit_mqtt_internal_event_handler.erl

@@ -9,7 +9,7 @@
 
 -behaviour(gen_event).
 
--export([init/1, handle_event/2, handle_call/2]).
+-export([init/1, handle_event/2, handle_call/2, handle_info/2]).
 
 -import(rabbit_misc, [pget/2]).
 
@@ -36,3 +36,6 @@ handle_event(_Event, ?STATE) ->
 
 handle_call(_Request, ?STATE) ->
     {ok, ok, ?STATE}.
+
+handle_info(_Info, State) ->
+    {ok, State}.