rcc

chore: Fix vignette building if tibble is missing #2718

Job	Run time
Smoke test: stock R	4m 5s
Check matrix	5s
rcc: ${{ matrix.os }} (${{ matrix.r }}) ${{ matrix.desc }}	0s
Without bit64	2m 11s
Without DBI	1m 54s
Without debugme	1m 53s
Without DiagrammeR	1m 49s
Without dplyr	1m 59s
Without formattable	1m 57s
Without ggplot2	1m 50s
Without lubridate	1m 44s
Without nanotime	2m 2s
Without nycflights13	1m 51s
Without palmerpenguins	1m 38s
Without scales	1m 58s
Without stringi	2m 5s
Without tibble	1m 59s
Without units	2m 13s
Without vdiffr	2m 2s
	35m 15s

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