(maint) use latest lein
(maint) use latest lein

This fixes acceptance test failures that cropped up today associated with OPS-5175

Conflicts:
	acceptance/setup/pre_suite/40_install_deps.rb

rbrw/puppetdb,wkalt/puppetdb,ajroetker/puppetdb,wkalt/puppetdb,kbrezina/puppetdb,grimradical/puppetdb,rbrw/puppetdb,waynr/puppetdb,ajroetker/puppetdb,shrug/puppetdb,grimradical/puppetdb,johnduarte/puppetdb,kbarber/puppetdb,johnduarte/puppetdb,mullr/puppetdb,johnduarte/puppetdb,ajroetker/puppetdb,mullr/puppetdb,waynr/puppetdb,senior/puppetdb,shrug/puppetdb,rbrw/puppetdb,wkalt/puppetdb,kbarber/puppetdb,puppetlabs/puppetdb,waynr/puppetdb,rbrw/puppetdb,kbrezina/puppetdb,wkalt/puppetdb,mullr/puppetdb,kbrezina/puppetdb,shrug/puppetdb,rbrw/puppetdb,mullr/puppetdb,ajroetker/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,shrug/puppetdb,senior/puppetdb,senior/puppetdb,grimradical/puppetdb,grimradical/puppetdb,johnduarte/puppetdb,kbrezina/puppetdb,highb/puppetdb,puppetlabs/puppetdb,highb/puppetdb,waynr/puppetdb,highb/puppetdb,kbarber/puppetdb,senior/puppetdb,mullr/puppetdb,highb/puppetdb,kbarber/puppetdb,puppetlabs/puppetdb