Update smpte2022 fastxor usage for python 3.9+

[juliusmilan]

Hi David

I tested and used your code, works perfectly, many thanks. Sending you an update, which I had to do, to use your code with python 3.9 and newer (but maybe even older python version would needed it, I didn't test for 3.8 and bellow).

Best wishes Julius

[davidfischer-ch]

Awesome thank you @juliusmilan