Update module to support Puppet7

[jippolito-nasuni]

Puppet 7 has been out for awhile. Can we get this module to support puppet7?

Current:

  "requirements": [
    {
      "name": "puppet",
      "version_requirement": ">=4.6.0 <7.0.0"
    }
  ],

[xenon8]

We will go directly to Puppet 8, see PR #823

[xenon8]

#823 merged into main :)