[PRQ#50933] Deletion Request for botan-2.3

MarsSeed [1] filed a deletion request for botan-2.3 [2]: Unused, insecure legacy version from 2018 of the botan crypto library. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/botan-2.3/