rcc

chore: Fix vignette building if tibble is missing #2724

Job	Run time
Smoke test: stock R	4m 16s
Check matrix	4s
rcc: ${{ matrix.os }} (${{ matrix.r }}) ${{ matrix.desc }}	0s
Without bit64	1m 57s
Without DBI	1m 46s
Without debugme	1m 52s
Without DiagrammeR	1m 49s
Without dplyr	1m 50s
Without formattable	1m 42s
Without ggplot2	1m 51s
Without lubridate	1m 45s
Without nanotime	2m 12s
Without nycflights13	1m 45s
Without palmerpenguins	2m 12s
Without scales	1m 47s
Without stringi	1m 51s
Without tibble	1m 49s
Without units	3m 28s
Without vdiffr	1m 56s
	35m 52s

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