Update voxpupuli-test requirement from ~> 7.2 to ~> 8.0

Updates the requirements on [voxpupuli-test](https://github.com/voxpupuli/voxpupuli-test) to permit the latest version.
- [Changelog](https://github.com/voxpupuli/voxpupuli-test/blob/master/CHANGELOG.md)
- [Commits](voxpupuli/voxpupuli-test@v7.2.0...v8.0.0)

---
updated-dependencies:
- dependency-name: voxpupuli-test
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile

@@ -4,7 +4,7 @@
 source ENV['GEM_SOURCE'] || 'https://rubygems.org'
 
 group :test do
-  gem 'voxpupuli-test', '~> 7.2',   :require => false
+  gem 'voxpupuli-test', '~> 8.0',   :require => false
   gem 'coveralls',                  :require => false
   gem 'simplecov-console',          :require => false
   gem 'puppet_metadata', '~> 4.0',  :require => false