normalize quarto_path()

[cderv]

which resolves symlink

which creates no difference now with quarto_binary_sitrep() results

Previously it was confusing

> quarto::quarto_version()
[1] '1.5.47'
> quarto::quarto_path()
[1] "/usr/local/bin/quarto"
> quarto::quarto_binary_sitrep()
✔ quarto R package will use /Applications/quarto/bin/quarto