Bugfix: Support ExFAT-formatted local backends on macOS Ventura

ExFAT-formatted disks could not be used as local backends starting from macOS
Ventura. Restic commands would fail with an "inappropriate ioctl for device"
error. This has now been fixed.

https://github.com/restic/restic/issues/4016
https://github.com/restic/restic/pull/4021
