The latest package release is 1.2.20 and the current aur version is 1.2.19. The last flagged out of date is June of this year so the assertion that it's been abandoned for over a year is false.

On Wed, Jul 14, 2021 at 8:53 PM <notify@aur.archlinux.org> wrote:

wilbowma [1] filed an orphan request for kanboard [2]:

The maintainer appears to have abandoned the package for over a year.

[1] https://aur.archlinux.org/account/wilbowma/
[2] https://aur.archlinux.org/pkgbase/kanboard/