fix AppVersionStringConverter object deserialization

Pilz.Updating/AppVersion.cs

@@ -2,7 +2,6 @@
 
 namespace Pilz.Updating;
 
-//[JsonConverter(typeof(AppVersionStringJsonConverter))]
 public class AppVersion(Version version, int build, Channels channel)
 {
     // P r o p e r t i e s

Pilz.Updating/Json/AppVersionStringJsonConverter.cs

@@ -56,10 +56,7 @@ public class AppVersionStringJsonConverter(bool serializeAsObject) : JsonConvert
             }
 
             if (reader.TokenType == JsonToken.StartObject)
-            {
-                return JToken.ReadFrom(reader).ToObject<AppVersion>();
-            }
-
+                return serializer.Deserialize<AppVersion>(reader);
         }
         catch (Exception ex)
         {