Update puppetlabs_spec_helper requirement from ~> 2.7 to ~> 3.0

Updates the requirements on [puppetlabs_spec_helper](https://github.com/puppetlabs/puppetlabs_spec_helper) to permit the latest version.
- [Release notes](https://github.com/puppetlabs/puppetlabs_spec_helper/releases)
- [Changelog](https://github.com/puppetlabs/puppetlabs_spec_helper/blob/main/CHANGELOG.md)
- [Commits](puppetlabs/puppetlabs_spec_helper@v2.7.0...v3.0.0)

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

Author: dependabot-preview[bot]

Gemfile

@@ -11,7 +11,7 @@ group :tests do
   gem 'simplecov-console'
 
   # the test gems required for module testing
-  gem 'puppetlabs_spec_helper', '~> 2.7'
+  gem 'puppetlabs_spec_helper', '~> 3.0'
   gem 'rspec-puppet'
 
   # since the Resource API runs inside the puppetserver, test against the JRuby versions we ship