Usage of deprecated `ggplot2::discrete_scale()` argument `scale_name`

[fkohrt]

Running the following code from the README...

https://github.com/EmilHvitfeldt/paletteer/blob/a8c27cee454bc13a8c49452b2c4a9c99eb777a2a/README.md?plain=1#L99-L103

...after setting options(lifecycle_verbosity = "error") leads to the following error:

Error:
! The `scale_name` argument of `discrete_scale()`
  is deprecated as of ggplot2 3.5.0.
Run `rlang::last_trace()` to see where the error occurred.