chore(gemfile+lock): update to latest gem versions (2021-W28) [skip ci]

* Automated using myii/ssf-formula#343

Author: myii

Gemfile

@@ -10,5 +10,5 @@ gem 'inspec',      '~> 4.22.22'
 # rubocop:disable Layout/LineLength
 gem 'kitchen-docker', git: 'https://gitlab.com/saltstack-formulas/infrastructure/kitchen-docker', branch: 'ssf'
 # rubocop:enable Layout/LineLength
-gem 'kitchen-inspec', '>= 2.2.1'
+gem 'kitchen-inspec', '>= 2.5.0'
 gem 'kitchen-salt', '>= 0.6.3'