Correct supported Puppet lower bound to 5.5.0
Correct supported Puppet lower bound to 5.5.0

Prior to this commit the metadata erroneously claimed support for 4x versions of Puppet, on which it has not been tested and would fail to run as the `ruby-pwsh` dependency requires Ruby 2.3 or higher which ships in Puppet 5x.

Further, Puppeet 4x is no longer officially supported at all.
puppetlabs/puppetlabs-powershell