Relax upper bounds for persistent stuff

Set the upper bounds for the persistent packages to 2.3, as
tempuhs-server will need persistent-2.2 in the future.

Signed-off-by: Alexander Berntsen <alexander@plaimi.net>
Signed-off-by: Stian Ellingsen <stian@plaimi.net>
Reviewed-by: Stian Ellingsen <stian@plaimi.net>