Fix visibility of MessageComponent.Empty (#3139)

Author: d4n3436

src/Discord.Net.Core/Entities/Interactions/MessageComponents/MessageComponent.cs

@@ -18,8 +18,8 @@ internal MessageComponent(List<IMessageComponent> components)
     }
 
     /// <summary>
-    ///     Returns a empty <see cref="MessageComponent"/>.
+    ///     Returns an empty <see cref="MessageComponent"/>.
     /// </summary>
-    internal static MessageComponent Empty
+    public static MessageComponent Empty
         => new([]);
 }