refactor: Make exception class serializable

src/Recyclarr.TrashLib/Config/Parsing/ErrorHandling/NoConfigurationFilesException.cs

@@ -1,9 +1,17 @@
+using System.Runtime.Serialization;
+
 namespace Recyclarr.TrashLib.Config.Parsing.ErrorHandling;
 
+[Serializable]
 public class NoConfigurationFilesException : Exception
 {
     public NoConfigurationFilesException()
         : base("No configuration YAML files found")
     {
     }
+
+    protected NoConfigurationFilesException(SerializationInfo info, StreamingContext context)
+        : base(info, context)
+    {
+    }
 }