Update Copyright 2023

[Peter Korsgaard]

>>>>> "Fred" == Fred Friedrich <berff2014 at outlook.com> writes:

 > Hello,
 > it seems like the copyright was not updated for a long time
 > :-). Consider this small fix for it:

Alternatively we could consider dropping the explicit copyright years
like we recently did in Buildroot:

https://gitlab.com/buildroot.org/buildroot/-/commit/f1d7155952d9abcad4d5d75b56508114469c2a1c

-- 
Bye, Peter Korsgaard