Remove duplicate dependency on puppetlabs/stdlib
Remove duplicate dependency on puppetlabs/stdlib

See: https://tickets.puppetlabs.com/browse/GEP-194 for an issue caused
by the redundant dependency.

cyberious/puppetlabs-registry,DSI-Ville-Noumea/puppetlabs-registry,MelanieGault/puppetlabs-registry,zshahan/puppetlabs-registry,puppetlabs/puppetlabs-registry,ferventcoder/puppetlabs-registry,jpogran/puppetlabs-registry