Fix memory leak

src/ImageSharp/Formats/Jxl/Processing/JxlQuantizer.cs

@@ -369,12 +369,18 @@ internal sealed class JxlQuantizer
         {
             if (rawQuantField.GetSize() != qf.GetSize())
             {
+                data.Dispose();
+                deviations.Dispose();
+
                 return false;
             }
 
             this.SetQuantField(qf, qf.GetRectangle(), rawQuantField);
         }
 
+        data.Dispose();
+        deviations.Dispose();
+
         return true;
     }