Fix kitchen-vagrant dep version

Signed-off-by: Tim Smith <tsmith@chef.io>

chef-sugar.gemspec

@@ -29,5 +29,5 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'chefspec',        '~> 7.0'
   spec.add_development_dependency 'test-kitchen',    '~> 1.18'
-  spec.add_development_dependency 'kitchen-vagrant', '~> 1.21'
+  spec.add_development_dependency 'kitchen-vagrant', '~> 1.2'
 end