fix(emqx_resource): some dialyzer complaints

apps/emqx_resource/rebar.config

@@ -7,6 +7,8 @@
 
 {extra_src_dirs, ["examples"]}.
 
+%% try to override the dialyzer 'race_conditions' defined in the top-level dir,
+%% but it doesn't work
 {dialyzer, [{warnings, [unmatched_returns, error_handling]}
            ]}.
 

apps/emqx_resource/src/emqx_resource_instance.erl

@@ -175,6 +175,8 @@ code_change(_OldVsn, State, _Extra) ->
 
 %%------------------------------------------------------------------------------
 
+%% suppress the race condition check, as these functions are protected in gproc workers
+-dialyzer({nowarn_function, [do_update/4, do_create/3, do_restart/1, do_stop/1, do_health_check/1]}).
 do_update(InstId, ResourceType, NewConfig, Params) ->
     case lookup(InstId) of
         {ok, #{mod := ResourceType, state := ResourceState, config := OldConfig}} ->