borgbackup: Fixes DEP error. Update to 1.1.11

borgbackup: Fixes DEP error. Update to 1.1.11

Fixes #12356

Several fixes but also new features has been added with this version.
Full changelog can be found in here --> https://github.com/borgbackup/borg/blob/1.1.11/docs/changes.rst#version-1111-2020-03-08 .

Signed-off-by: Erik Kapfer <ummeegge@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
Reviewed-by: Jonatan Schlag <jonatan.schlag@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>