lp:1596045 update juju/testing dependency
lp:1596045 update juju/testing dependency

Fixes Mongo version detection on Windows.

waigani/juju,howbazaar/juju,axw/juju,gabriel-samfira/juju,anastasiamac/juju,alesstimec/juju,alesstimec/juju,frankban/juju,bz2/juju,bac/juju,anastasiamac/juju,macgreagoir/juju,bz2/juju,macgreagoir/juju,bz2/juju,bz2/juju,waigani/juju,dimitern/juju,bac/juju,kat-co/juju,gabriel-samfira/juju,dooferlad/juju,reedobrien/juju,kat-co/juju,waigani/juju,marcmolla/juju,dooferlad/juju,howbazaar/juju,mjs/juju,marcmolla/juju,perrito666/juju,dooferlad/juju,mjs/juju,ericsnowcurrently/juju,reedobrien/juju,frankban/juju,macgreagoir/juju,perrito666/juju,dimitern/juju,perrito666/juju,dimitern/juju,kat-co/juju,anastasiamac/juju,perrito666/juju,macgreagoir/juju,reedobrien/juju,ericsnowcurrently/juju,axw/juju,mikemccracken/juju,howbazaar/juju,marcmolla/juju,dooferlad/juju,mjs/juju,mjs/juju,mikemccracken/juju,anastasiamac/juju,waigani/juju,axw/juju,frankban/juju,howbazaar/juju,marcmolla/juju,gabriel-samfira/juju,marcmolla/juju,mjs/juju,dooferlad/juju,kat-co/juju,mikemccracken/juju,howbazaar/juju,ericsnowcurrently/juju,mjs/juju,ericsnowcurrently/juju,ericsnowcurrently/juju,AdamIsrael/juju,mikemccracken/juju,AdamIsrael/juju,AdamIsrael/juju,axw/juju,bz2/juju,gabriel-samfira/juju,mjs/juju,anastasiamac/juju,kat-co/juju,macgreagoir/juju,axw/juju,alesstimec/juju,frankban/juju,reedobrien/juju,dimitern/juju,frankban/juju,alesstimec/juju,dimitern/juju,bac/juju,AdamIsrael/juju,mikemccracken/juju,gabriel-samfira/juju,reedobrien/juju,perrito666/juju,alesstimec/juju,bac/juju,bac/juju