Update dependency test-kitchen to '~> 3.8.0' (#72)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Gemfile

@@ -24,7 +24,7 @@ group :development do
 end
 
 group :integration do
-  gem 'test-kitchen', '~> 3.7.0'
+  gem 'test-kitchen', '~> 3.8.0'
   gem 'kitchen-vagrant'
   gem 'kitchen-dokken'
   gem 'kitchen-inspec'