[PRQ#70060] Deletion Request for signal-backup-decode

MarsSeed [1] filed a deletion request for signal-backup-decode [2]: No longer works with current Signal applications' encryption. [a] EOL for 4 years. [b] [a]: https://github.com/pajowu/signal-backup-decode/issues [b]: https://github.com/pajowu/signal-backup-decode [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/signal-backup-decode/