Update src/ImageSharp/Image.FromStream.cs

Co-authored-by: Brian Popow <38701097+brianpopow@users.noreply.github.com>

src/ImageSharp/Image.FromStream.cs

@@ -680,7 +680,7 @@ namespace SixLabors.ImageSharp
 
             using (var memoryStream = new MemoryStream()) // should really find a nice way to use a pool for these!!
             {
-                await stream.CopyToAsync(memoryStream);
+                await stream.CopyToAsync(memoryStream).ConfigureAwait(false);
                 memoryStream.Position = 0;
 
                 return await action(memoryStream).ConfigureAwait(false);