Update PDK to 3.0.1

Author: smoeding

.pdkignore

@@ -29,6 +29,7 @@
 /.fixtures.yml
 /Gemfile
 /.gitattributes
+/.github/
 /.gitignore
 /.pdkignore
 /.puppet-lint.rc
@@ -41,4 +42,3 @@
 /.vscode/
 /.sync.yml
 /.devcontainer/
-/.github/

Gemfile

@@ -34,12 +34,17 @@ group :development do
   gem "rubocop", '= 1.48.1',                     require: false
   gem "rubocop-performance", '= 1.16.0',         require: false
   gem "rubocop-rspec", '= 2.19.0',               require: false
+  gem "puppet-strings", '~> 4.0',                require: false
   gem "rb-readline", '= 0.5.5',                  require: false, platforms: [:mswin, :mingw, :x64_mingw]
 end
 group :system_tests do
   gem "puppet_litmus", '~> 1.0', require: false, platforms: [:ruby, :x64_mingw]
   gem "serverspec", '~> 2.41',   require: false
 end
+group :release_prep do
+  gem "puppet-strings", '~> 4.0',         require: false
+  gem "puppetlabs_spec_helper", '~> 6.0', require: false
+end
 
 puppet_version = ENV['PUPPET_GEM_VERSION']
 facter_version = ENV['FACTER_GEM_VERSION']