(#14287) Fix apt::pin resource for rspec-puppet.
(#14287) Fix apt::pin resource for rspec-puppet.

The shorthand syntax cause rspec-puppet failure for external modules
depending on the puppet-apt module. This patch uses the require
metaparameter to avoid this issue.

gizmoguy/puppetlabs-apt,imphil/puppetlabs-apt,gwdg/puppetlabs-apt,imphil/puppetlabs-apt,puppetlabs/puppetlabs-apt,zoide/puppet-apt