Cancel timers async

Where it wasn't already async. To slightly improve performance.

src/cowboy_clock.erl

@@ -93,7 +93,7 @@ handle_cast(_Msg, State) ->
 -spec handle_info(any(), State) -> {noreply, State} when State::#state{}.
 handle_info(update, #state{universaltime=Prev, rfc1123=B1, tref=TRef0}) ->
 	%% Cancel the timer in case an external process sent an update message.
-	_ = erlang:cancel_timer(TRef0),
+	_ = erlang:cancel_timer(TRef0, [{async, true}, {info, false}]),
 	T = erlang:universaltime(),
 	B2 = update_rfc1123(B1, Prev, T),
 	ets:insert(?MODULE, {rfc1123, B2}),

src/cowboy_http.erl

@@ -328,7 +328,7 @@ cancel_timeout(State=#state{timer=TimerRef}) ->
 		_ ->
 			%% Do a synchronous cancel and remove the message if any
 			%% to avoid receiving stray messages.
-			_ = erlang:cancel_timer(TimerRef),
+			_ = erlang:cancel_timer(TimerRef, [{async, false}, {info, false}]),
 			receive
 				{timeout, TimerRef, _} -> ok
 			after 0 ->

src/cowboy_websocket.erl

@@ -391,7 +391,7 @@ set_idle_timeout(State=#state{opts=Opts, timeout_ref=PrevRef}, TimeoutNum) ->
 	%% options are changed dynamically.
 	_ = case PrevRef of
 		undefined -> ignore;
-		PrevRef -> erlang:cancel_timer(PrevRef)
+		PrevRef -> erlang:cancel_timer(PrevRef, [{async, true}, {info, false}])
 	end,
 	case maps:get(idle_timeout, Opts, 60000) of
 		infinity ->