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