Remove clisymbols and crayon dependencies + remove tidyselect deprecation warnings.

[olivroy]

Description

I wanted to open this PR to replace clisymbols and crayon dependencies by cli.

However, when trying to run tests, I ran into a problem. I therefore included a simple fix in 671a4b9. Basically, it protects against the case where self$last_update is NULL (length 0)

Finally, when running tests, I noted a lot of tidyselect deprecation warnings. Basically, dplyr::select(.data$col) is deprecated in favor of dplyr::select("col"). Same goes for tidyr::unnest() and dplyr::pull().

Also, using dplyr::across() without fn is deprecated in favour of dplyr::pick(), so I also made this change.

Cheers!

Checklist

• Code compiles correctly
• Created tests which fail without the change (if applicable)
• All lint and unit tests passing
• Extended the README / documentation, if necessary
• Updated NEWS.md

Additional Comments

N/A

[bgrnwd]

@olivroy Thanks for the PR! We'll give it a review in the next week or so.