[PRQ#50289] Merge Request for virtualbox6.1-bin

MarsSeed [1] filed a request to merge virtualbox6.1-bin [2] into virtualbox6-bin [3]: It seems reasonable to merge these two pkgbases, since they are duplicates. 'virtualbox6-bin' was submitted to AUR a little bit earlier, for the v6.1 line. There's no v6.2 and higher point version, and only the v6.1 line is maintained by upstream for the legacy VirtualBox 6 product. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/virtualbox6.1-bin/ [3] https://aur.archlinux.org/pkgbase/virtualbox6-bin/