rhub::check_for_cran() deprecated

[louisaslett]

The rhub::check_for_cran() function is deprecated. Trying to run it results in the following:

> rhub::check_for_cran()
This function is deprecated and defunct since rhub v2.
Please see `?rhubv2` on transitioning to the new rhub functions.

Therefore the following line in the book is now out-of-date and probably needs to be updated per the R-hub v2 guidelines at https://r-hub.github.io/rhub/articles/rhubv2.html

r-pkgs/release.Rmd

Line 286 in ec8714b

`rhub::check_for_cran()` is a good option for a typical CRAN package and is morally similar to the GHA workflow configured by `usethis::use_github_action("check-standard")`.