updown  filed a orphan request for pam_u2f :
I wrote an E-Mail to the maintainer a week ago asking if he would update the package. I got no response from him.
 https://aur.archlinux.org/account/updown/  https://aur.archlinux.org/pkgbase/pam_u2f/
Request #11276 has been rejected by Eschwartz :
stale .SRCINFO was fixed, requester was added as comaintainer