Fix acceptance tests workflow execution

[smortex]

The workflow is currently broken. Each time it stats, it produce the
following error:

Invalid workflow file: .github/workflows/acceptance_tests.yml#L22
You have an error in your yaml syntax on line 22

Example failure:
https://github.com/OpenVoxProject/facter/actions/runs/15694825979

This regression was introduced in #5

[smortex]

  Test Case /Users/runner/hostedtoolcache/Ruby/3.2.8/arm64/lib/ruby/gems/3.2.0/gems/beaker-puppet-4.2.0/setup/aio/010_Install_Puppet_Agent.rb reported: #<RuntimeError: The URL for puppet-agent download, https://downloads.puppet.com/mac/puppet8/15/x86_64/index_by_lastModified_reverse.html, returned Not Found with 404>
    Test line: /Users/runner/hostedtoolcache/Ruby/3.2.8/arm64/lib/ruby/gems/3.2.0/gems/beaker-puppet-4.2.0/setup/aio/010_Install_Puppet_Agent.rb:21:in `block (3 levels) in run_test'

I guess we need some kind of beaker-openvox to replace beaker-puppet. We can probably fork the old repo and start updating URL there?

[bastelfreak]

for module testing, we switched from beaker-puppet to https://github.com/voxpupuli/beaker_puppet_helpers