[PRQ#65763] Merge Request for pantheon

MarsSeed [1] filed a request to merge pantheon [2] into besu [3]: The former package is dead (cannot download files in source array). And upstream has been renamed to besu in 2019. [a] [a]: https://github.com/PegaSysEng/pantheon [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/pantheon/ [3] https://aur.archlinux.org/pkgbase/besu/