emulators/virtualbox-ose{,-kmod,-additions}: update to 6.1.48

Based on patch from Sergey V. Dyatko <sergey.dyatko@gmail.com>.
Changelog: https://www.virtualbox.org/wiki/Changelog-6.1#v48

PR: 274555
Approved by: arrowd (mentor)
Differential Revision: https://reviews.freebsd.org/D42322
MFH: 2023Q4