`ToHex()` should be uppercase by default

DiscordChatExporter.Core/Utils/Extensions/BinaryExtensions.cs

@@ -4,12 +4,16 @@ namespace DiscordChatExporter.Core.Utils.Extensions;
 
 public static class BinaryExtensions
 {
-    public static string ToHex(this byte[] data)
+    public static string ToHex(this byte[] data, bool isUpperCase = true)
     {
         var buffer = new StringBuilder(2 * data.Length);
 
         foreach (var b in data)
-            buffer.Append(b.ToString("x2"));
+        {
+            buffer.Append(
+                b.ToString(isUpperCase ? "X2" : "x2")
+            );
+        }
 
         return buffer.ToString();
     }