…d of the cran version (#3817)

Related to #3789 and #3790

Looking at the logs, it seems that the current CI was using
adbcdrivermanager installed from CRAN, and testing of the latest driver
and driver manager combinations had not been performed.
This PR will make a change to ensure that adbcdrivermanager is installed
locally.

This required a minor change to prevent the bootstrap.R script from
failing with `pak::pkg_install("local::.")` or something else.

We can check the driver manager version via the logs of the
`r-lib/actions/setup-r-dependencies` step.

Before:

```
  ─ Session info ───────────────────────────────────────────────────────────────
   setting  value
   version  R version 4.5.2 (2025-10-31)
   os       Ubuntu 24.04.3 LTS
   system   x86_64, linux-gnu
   ui       X11
   language (EN)
   collate  C.UTF-8
   ctype    C.UTF-8
   tz       UTC
   date     2025-12-17
   pandoc   NA
   quarto   NA
  
  ─ Packages ───────────────────────────────────────────────────────────────────
   package           * version date (UTC) lib source
   adbcdrivermanager   0.21.0  2025-11-20 [1] RSPM
   base              * 4.5.2   2025-10-31 [3] local
```

After this change:

```
  ─ Session info ───────────────────────────────────────────────────────────────
   setting  value
   version  R version 4.5.2 (2025-10-31)
   os       Ubuntu 24.04.3 LTS
   system   x86_64, linux-gnu
   ui       X11
   language (EN)
   collate  C.UTF-8
   ctype    C.UTF-8
   tz       UTC
   date     2025-12-17
   pandoc   NA
   quarto   NA
  
  ─ Packages ───────────────────────────────────────────────────────────────────
   package           * version     date (UTC) lib source
   adbcdrivermanager   0.21.0.9000 2025-12-17 [1] local
   base              * 4.5.2       2025-10-31 [3] local
```