Implement IDisposable for FileAttachment in WordleModule

This change ensures that the FileAttachment object in the WordleModule.cs is properly disposed following its use. This enhancement is made by utilizing the 'using' keyword to automatically manage resources, thus reducing the likelihood of memory leaks.

Blink3.Bot/Modules/WordleModule.cs

@@ -71,7 +71,7 @@ await RespondErrorAsync("No game in progress",
 
         using MemoryStream image = new();
         await wordleGameService.GenerateImageAsync(guess, image);
-        FileAttachment attachment = new(image, $"{guess.Word}.png");
+        using FileAttachment attachment = new(image, $"{guess.Word}.png");
 
         ComponentBuilder? component = new ComponentBuilder().WithButton("Define", $"blink-define-word_{guess.Word}");