Update CI infrastructure to latest version

Author: ekohl

.github/workflows/ci.yml

@@ -13,6 +13,6 @@ concurrency:
 jobs:
   puppet:
     name: Puppet
-    uses: voxpupuli/gha-puppet/.github/workflows/basic.yml@v1
+    uses: voxpupuli/gha-puppet/.github/workflows/basic.yml@v2
     with:
       rubocop: false

Gemfile

@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
 
-gem 'puppet', ENV['PUPPET_GEM_VERSION'] || '>= 3.8', require: false
-gem 'puppet_metadata', '~> 1.0',  require: false
-gem 'voxpupuli-test', require: false
+gem 'puppet', ENV['PUPPET_GEM_VERSION'] || '>= 6.1', require: false
+gem 'puppet_metadata', '~> 4.0',  require: false
+gem 'voxpupuli-test', '~> 7.0', require: false