PSBP-Library updated to Scala 3

Now that Scala 3 is RC1 (language features are stable),
I am, once again, updating my PSBP-Library.

See PSBP-Library (PSBP) · GitHub for the project.
See https://psbp-library.github.io/ for documentation.

All comments are welcome at psbp.blog[at]gmail.com.

Especially comments about my usage of type classes (maybe there are more idiomatic usages).

Thanks