(maint) Pin to puppet-syntax 3.2.1

This avoids a bug with a missing require in 3.3.0. Eventually we want to
move to 4.0.0, but this is the latest valid version for now.

Author: Magisus

Gemfile

@@ -17,7 +17,9 @@ gem 'puppet-lint-variable_contains_upcase',                      '~> 2.0'
 gem 'puppet-lint-version_comparison-check',                      '~> 2.0'
 gem 'puppet-lint',                                               '~> 4.0'
 gem 'puppet-strings',                                            '~> 4.0'
-gem 'puppet-syntax',                                             '~> 3.0'
+# We need this to go to 4.0 at least for puppet8 support
+# Pin to 3.2.1 to avoid a bug in 3.3.0
+gem 'puppet-syntax',                                             '3.2.1'
 # We want to go to 8.0 with this once we can move to rspec-puppet 5.x
 gem 'puppetlabs_spec_helper',                                    '~> 7.0.3'
 gem 'r10k',                                                      '~> 5.0'