Upgrade the puppet-concat module

Originally created by @groente on #16172 (Redmine)

Applying puppet-lizard-manifests on stone breaks with:

Error: Failed to apply catalog: uninitialized constant Puppet::Type::Concat_file

It does work with the latest concat version. Can you look into a suitable upgrade?

Parent Task: tails/sysadmin#15500

Edited May 15, 2020 by groente