Fix warnings

src/ImageSharp/Processing/Processors/Transforms/AffineTransformProcessor{TPixel}.cs

@@ -45,7 +45,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Transforms
             if (this.transformMatrix.Equals(default) || this.transformMatrix.Equals(Matrix3x2.Identity))
             {
                 // The clone will be blank here copy all the pixel data over
-                source.GetPixelSpan().CopyTo(destination.GetPixelSpan());
+                source.GetPixelMemoryGroup().CopyTo(destination.GetPixelMemoryGroup());
                 return;
             }
 

src/ImageSharp/Processing/Processors/Transforms/CropProcessor{TPixel}.cs

@@ -41,7 +41,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Transforms
                 && this.SourceRectangle == this.cropRectangle)
             {
                 // the cloned will be blank here copy all the pixel data over
-                source.GetPixelSpan().CopyTo(destination.GetPixelSpan());
+                source.GetPixelMemoryGroup().CopyTo(destination.GetPixelMemoryGroup());
                 return;
             }
 

src/ImageSharp/Processing/Processors/Transforms/ProjectiveTransformProcessor{TPixel}.cs

@@ -45,7 +45,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Transforms
             if (this.transformMatrix.Equals(default) || this.transformMatrix.Equals(Matrix4x4.Identity))
             {
                 // The clone will be blank here copy all the pixel data over
-                source.GetPixelSpan().CopyTo(destination.GetPixelSpan());
+                source.GetPixelMemoryGroup().CopyTo(destination.GetPixelMemoryGroup());
                 return;
             }
 

src/ImageSharp/Processing/Processors/Transforms/Resize/ResizeProcessor{TPixel}.cs

@@ -81,7 +81,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Transforms
                 && sourceRectangle == this.targetRectangle)
             {
                 // The cloned will be blank here copy all the pixel data over
-                source.GetPixelSpan().CopyTo(destination.GetPixelSpan());
+                source.GetPixelMemoryGroup().CopyTo(destination.GetPixelMemoryGroup());
                 return;
             }
 

src/ImageSharp/Processing/Processors/Transforms/RotateProcessor{TPixel}.cs

@@ -98,7 +98,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Transforms
             if (MathF.Abs(degrees) < Constants.Epsilon)
             {
                 // The destination will be blank here so copy all the pixel data over
-                source.GetPixelSpan().CopyTo(destination.GetPixelSpan());
+                source.GetPixelMemoryGroup().CopyTo(destination.GetPixelMemoryGroup());
                 return true;
             }