Fix build error in Benchmark project

tests/ImageSharp.Benchmarks/Codecs/Jpeg/DecodeJpegParseStreamOnly.cs

@@ -5,6 +5,7 @@ using System.IO;
 using BenchmarkDotNet.Attributes;
 using SixLabors.ImageSharp.Formats.Jpeg;
 using SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder;
+using SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters;
 using SixLabors.ImageSharp.IO;
 using SixLabors.ImageSharp.Tests;
 using SDSize = System.Drawing.Size;
@@ -58,6 +59,8 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg
             public override void InjectFrameData(JpegFrame frame, IRawJpegData jpegData)
             {
             }
+
+            public override JpegColorConverter GetConverter(JpegFrame frame, IRawJpegData jpegData) => JpegColorConverter.GetConverter(jpegData.ColorSpace, frame.Precision);
         }
     }
 }