chore: Update the streaming example to use iterator.return over dispose

examples/timeline-with-streaming.ts

@@ -6,10 +6,7 @@ const subscribe = async (): Promise<void> => {
     accessToken: "<TOKEN>",
   });
 
-  using events = masto.hashtag.subscribe({ tag: "mastojs" });
-  console.log("subscribed to #mastojs");
-
-  for await (const event of events) {
+  for await (const event of masto.hashtag.subscribe({ tag: "mastojs" })) {
     switch (event.event) {
       case "update": {
         console.log("new post", event.payload.content);