Remove `tbl_sum()` reexport (#6284)

Reexport `type_sum()` from pillar rather than from tibble (#6283)

Update to roxygen2 7.2.0

Catch the `slice_sample()` case of `replace = FALSE` and `n < size` (#6282)

Merge pull request #6280 from DavisVaughan/feature/clean-up-import-from-calls

Merge 54cabe1 into 61dd26f