Fix ulong converter

src/ExtensionStoreAPI.Core/DataTypes/MacroDeck/ExtensionManifest.cs

@@ -21,7 +21,7 @@ public class ExtensionManifest
      [JsonPropertyName("category")]
      public string? Category { get; set; }
 
-     [JsonPropertyName("author-discord-userid"), JsonConverter(typeof(StringToLongConverter))]
+     [JsonPropertyName("author-discord-userid"), JsonConverter(typeof(StringToUlongConverter))]
      public ulong? AuthorDiscordUserId { get; set; }
 
      [JsonPropertyName("repository")]

src/ExtensionStoreAPI.Core/Json/StringToUlongConverter.cs

@@ -0,0 +1,22 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace ExtensionStoreAPI.Core.Json;
+
+public class StringToUlongConverter : JsonConverter<ulong>
+{
+    public override ulong Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        if (reader.TokenType != JsonTokenType.String)
+        {
+            return 0;
+        }
+
+        return ulong.TryParse(reader.GetString(), out var value) ? value : 0;
+    }
+
+    public override void Write(Utf8JsonWriter writer, ulong value, JsonSerializerOptions options)
+    {
+        writer.WriteStringValue(value.ToString());
+    }
+}