(maint) Update lein-parent to 0.3.7
(maint) Update lein-parent to 0.3.7

As of clj-parent 1.7.28, we stopped being able to use the older version
of clj-parent due a change in transitive dependencies.

puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppet-server,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver