sqlData() returns a tibble for tibble input

This breaks downstream/upstream when trying `sqlAppendTable()` with verbose lifecycle failures.

``` r
con <- RPostgres::postgresDefault()
DBI::sqlData(con, tibble::tibble(a = 1))
#> # A tibble: 1 × 1
#>   a        
#>   <SQL>    
#> 1 1::float8
```

<sup>Created on 2021-12-21 by the [reprex package](https://reprex.tidyverse.org) (v2.0.1)</sup>