Remove inheritance

src/ImageSharp/Common/Exceptions/ImageProcessingException.cs

@@ -8,7 +8,7 @@ namespace SixLabors.ImageSharp
     /// <summary>
     /// The exception that is thrown when an error occurs when applying a process to an image.
     /// </summary>
-    public class ImageProcessingException : Exception
+    public sealed class ImageProcessingException : Exception
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="ImageProcessingException"/> class.

src/ImageSharp/Processing/Processors/Transforms/DegenerateTransformException.cs

@@ -8,7 +8,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Transforms
     /// <summary>
     /// Represents an error that occurs during a transform operation.
     /// </summary>
-    public sealed class DegenerateTransformException : ImageProcessingException
+    public sealed class DegenerateTransformException : Exception
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="DegenerateTransformException"/> class.