bump minimal stdlib version to 4.0.0

This has been pointed out by Mathieu Gagné during the I39b52b2b review,
We use any2array since Icf2a4bed8980137181810f2f5d3a38db54af4443. This
parser function was introduced in puppetlabs-stdlib 4.0.0.

Change-Id: Ib0e9821d8e9a1296d7b931de57b8a6b94269df23
Merge "bump minimal stdlib version to 4.0.0"