(FM-5055) Pin rspec-puppet to 2.3.2 in Gemfile
(FM-5055) Pin rspec-puppet to 2.3.2 in Gemfile

During CI Triage, the WSUS Client pipeline was failing due to rspec-puppet
changing from version 2.3.2 to 2.4.0.  This commit pins rspec-puppet to
2.3.2 until the incompatibility is resolved in MODULES-3240.

ferventcoder/puppetlabs-wsus_client,puppetlabs/puppetlabs-wsus_client