rcc

chore: Fix vignette building if tibble is missing #2725

Job	Run time
Smoke test: stock R	3m 26s
Check matrix	4s
rcc: ${{ matrix.os }} (${{ matrix.r }}) ${{ matrix.desc }}	0s
Without bit64	1m 49s
Without DBI	1m 48s
Without debugme	1m 44s
Without DiagrammeR	1m 50s
Without dplyr	1m 48s
Without formattable	1m 57s
Without ggplot2	1m 45s
Without lubridate	1m 56s
Without nanotime	1m 56s
Without nycflights13	2m 40s
Without palmerpenguins	1m 57s
Without scales	2m 1s
Without stringi	2m 57s
Without tibble	3m 36s
Without units	1m 47s
Without vdiffr	2m 27s
	37m 28s

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