PhotonX [1] filed a deletion request for skypeforlinux-beta-bin [2]: Seems like the problem which has been introduced in the new 8.x series of skypeforlinux has been fixed so there is no need in having the 5.x series any more.
[1] https://aur.archlinux.org/account/PhotonX/ [2] https://aur.archlinux.org/pkgbase/skypeforlinux-beta-bin/
