Fix CI by allowing actions from `actions/` and `ruby/`

[connorshea]

Describe the bug

CI is not currently running on PRs because the settings for GitHub Actions are too strict. This needs to be updated by someone with repo settings access to enable GitHub Actions to be used from the ruby/ and actions/ namespaces.

To Reproduce

See https://github.com/faker-ruby/faker/actions/runs/28744410072 for example.

Error message:

The actions actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd and ruby/setup-ruby@c4e5b1316158f92e3d49443a9d58b31d25ac0f8f are not allowed in faker-ruby/faker because all actions must be from a repository owned by faker-ruby or match the pattern: ruby/setup-ruby. All actions must also be pinned to a full-length commit SHA.

Expected behavior

CI runs on PRs.

Additional context

N/A