Remove deprecated API usage

Summary: related to T13767

Reviewers: ivica

Reviewed By: ivica

Subscribers: miljen, iljazovic

Differential Revision: https://repo.mireo.local/D28958

include/async_mqtt5/impl/ping_op.hpp

@@ -60,7 +60,7 @@ public:
 	}
 
 	void perform() {
-		_ping_timer->expires_from_now(compute_wait_time());
+		_ping_timer->expires_after(compute_wait_time());
 		_ping_timer->async_wait(
 			asio::prepend(std::move(*this), on_timer {})
 		);