flipflop97 [1] filed a orphan request for adwaita-icon-theme-git [2]:

The package needs maintainer action as the source has moved which makes the package unable to download source files. I commented ~2 months ago about this and there seems to be no response nor action from the maintainer.

[1] https://aur.archlinux.org/account/flipflop97/ [2] https://aur.archlinux.org/pkgbase/adwaita-icon-theme-git/