package/cryptsetup: bump version to 2.8.1
For release note, see:
https://gitlab.com/cryptsetup/cryptsetup/-/blob/v2.8.1/docs/v2.8.1-ReleaseNotes
Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>