fix: typing indicator lasting longer than 10s

Sources/zundamon/Wolfram.swift

@@ -48,7 +48,12 @@ struct Wolfram {
         client: DiscordClient,
         ctx: MessageCreate
     ) async throws {
-        try await client.triggerTypingIndicator(channelId: ctx.channel_id)
+        let typingIndicatorTask = Task {
+            while !Task.isCancelled {
+                try await client.triggerTypingIndicator(channelId: ctx.channel_id)
+                try await Task.sleep(for: .seconds(8))
+            }
+        }
 
         let question = String(args.joined(separator: " "))
 
@@ -59,6 +64,7 @@ struct Wolfram {
         if let img = img {
             attachments.append(.init(image: .init(url: img.absoluteString)))
         }
+        typingIndicatorTask.cancel()
 
         try await client.createMessage(channelId: ctx.channel_id, payload: .init(
             content: answer,