libre: [debootstrap]: Update to 1.0.34.
This also unbreaks PureOS debootstrap. This has been tested with the
following command:
$ sudo debootstrap byzantium rootfs https://repo.puri.sm/pureos
and it produced a rootfs that works fine when one chroots inside.
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>