Tahvok [1] filed a deletion request for gridcoinresearch-git [2]:

The main package no longer provides gridcoinresearch-upgrader-git

Please remove gridcoinresearch-upgrader-git from the list the main gridcoinresearch-git package provides

[1] https://aur.archlinux.org/account/Tahvok/ [2] https://aur.archlinux.org/pkgbase/gridcoinresearch-git/