Update Convolution2PassProcessor{TPixel}.cs

Author: JimBobSquarePants

src/ImageSharp/Processing/Processors/Convolution/Convolution2PassProcessor{TPixel}.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
-using System.Buffers;
 using System.Numerics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
@@ -107,8 +106,6 @@ protected override void OnFrameApply(ImageFrame<TPixel> source)
 
         mapXY.BuildSamplingOffsetMap(this.KernelX.Length, this.KernelX.Length, interest, this.BorderWrapModeX, this.BorderWrapModeY);
 
-        MemoryAllocator allocator = this.Configuration.MemoryAllocator;
-
         // Horizontal convolution
         HorizontalConvolutionRowOperation horizontalOperation = new(
             interest,