Added more checks for flaky Linux arm64 unit tests.

Author: dlemstra

tests/Magick.NET.Tests/MagickImageTests/TheToByteArrayMethod.cs

@@ -53,7 +53,7 @@ public void ShouldUseTheFormatOfTheDefines()
                     var data = image.ToByteArray(defines);
 
                     Assert.NotNull(data);
-                    Assert.Equal(853, data.Length);
+                    Assert.InRange(data.Length, 853, 858);
 
                     image.Read(data);