Remove github_changelog_generator puppet_metadata

.sync.yml

@@ -16,18 +16,10 @@ appveyor.yml:
 Gemfile:
   unmanaged: false
   optional:
-    ':development':
-      - gem: 'github_changelog_generator'
-        version: '~> 1.15'
-        condition: "Gem::Version.new(RUBY_VERSION.dup) >= Gem::Version.new('2.3.0')"
       - gem: 'webmock'
         #linter_options:
         #  - 'no-parameter_types-check'
         #  - 'no-legacy_facts'
-    ':test':
-      # provides metadata2gha, needed for unit tests
-      - gem: 'puppet_metadata'
-        version: '~> 1.9.0'
 
 spec/spec_helper.rb:
   coverage_report: true

Gemfile

@@ -34,16 +34,12 @@ group :development do
   gem "rubocop-performance", '= 1.9.1',                require: false
   gem "rubocop-rspec", '= 2.0.1',                      require: false
   gem "rb-readline", '= 0.5.5',                        require: false, platforms: [:mswin, :mingw, :x64_mingw]
-  gem "github_changelog_generator", '~> 1.15',         require: false if Gem::Version.new(RUBY_VERSION.dup) >= Gem::Version.new('2.3.0')
   gem "webmock",                                       require: false
 end
 group :system_tests do
   gem "puppet_litmus", '< 1.0.0', require: false, platforms: [:ruby]
   gem "serverspec", '~> 2.41',    require: false
 end
-group :test do
-  gem "puppet_metadata", '~> 1.9.0', require: false
-end
 
 puppet_version = ENV['PUPPET_GEM_VERSION']
 facter_version = ENV['FACTER_GEM_VERSION']