Let ruby determine versions of dependencies

ruby's dependency resolver should be well able to determine what
version limits are imposed to libraries based on the strict versioning
that we have on the puppet gem.

if things break because some things move to higher major versions, I'll
fix the issues then.

Gemfile

@@ -7,21 +7,15 @@ gem 'puppet', puppetversion
 gem 'rake'
 
 group :tests do
-  gem 'metadata-json-lint', '~> 4.0'
+  gem 'metadata-json-lint'
   # Use info from metadata.json for tests
   gem 'puppetlabs_spec_helper'
   gem 'puppet-lint', '>= 2.3.0'
-  # rubocop:disable Bundler/DuplicatedGem
-  gem 'puppet_metadata', '~> 3.6', require: false if Gem::Version.new(RUBY_VERSION.dup) >= Gem::Version.new('2.7.0')
-  gem 'puppet_metadata', '~> 2.1', require: false if Gem::Version.new(RUBY_VERSION.dup) < Gem::Version.new('2.7.0')
-  # rubocop:enable Bundler/DuplicatedGem
-  gem 'puppet-syntax', '~> 3.3'
+  gem 'puppet_metadata'
+  gem 'puppet-syntax'
   gem 'rspec-puppet', '>= 2.4.0'
   # This draws in rubocop and other useful gems for puppet tests
-  # rubocop:disable Bundler/DuplicatedGem
-  gem 'voxpupuli-test', '~> 7.1', require: false if Gem::Version.new(RUBY_VERSION.dup) >= Gem::Version.new('2.7.0')
-  gem 'voxpupuli-test', '~> 5.7', require: false if Gem::Version.new(RUBY_VERSION.dup) < Gem::Version.new('2.7.0')
-  # rubocop:enable Bundler/DuplicatedGem
+  gem 'voxpupuli-test'
 end
 
 group :docs do