Drush Jailed by Jailshell
There's no assistance available, really, this is out of your hands and can only be fixed by the server admins.

Your three options are:


Convince your hosting provider to upgrade the version of PHP you have available in the shell. If they tell you they don't know how to do that, go to option 3.
Downgrade drush to something that works with old versions of php
Change your hosting provider to one who's got their act together. Your current provider hasn't, clearly.