Update rspec-puppet requirement from ~> 2.11.1 to ~> 2.12.0

Updates the requirements on [rspec-puppet](https://github.com/puppetlabs/rspec-puppet) to permit the latest version.
- [Release notes](https://github.com/puppetlabs/rspec-puppet/releases)
- [Changelog](https://github.com/puppetlabs/rspec-puppet/blob/master/CHANGELOG.md)
- [Commits](puppetlabs/rspec-puppet@v2.11.1...v2.12.0)

---
updated-dependencies:
- dependency-name: rspec-puppet
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Gemfile

@@ -21,7 +21,7 @@ gem 'puppet',                                                    '~> 7.5'
 gem 'puppetlabs_spec_helper',                                    '~> 4.0'
 gem 'r10k',                                                      '~> 3.8'
 gem 'ra10ke',                                                    '~> 1.0'
-gem 'rspec-puppet',                                              '~> 2.11.1'
+gem 'rspec-puppet',                                              '~> 2.12.0'
 gem 'rubocop',                                                   '~> 1.12'
 gem 'unf_ext',                                                   '~> 0.0.8'
 gem 'yamllint',                                                  '~> 0.0.9'