Revert "(MAINT) - TEMP pin to FFI 1.15.2" and REVERT "(maint) - Pin ffi to 1.15.5"

[jordanbreen28]

This reverts commit 4515c9d025ad3fdba5edc1e0f2541d76709eb776. This also reverts the subsequent commit 18efae6eb1b333b412ec19f008913bf1f5fe3b2a.

This issue has been since fixed upstream in puppet, so we can now remove these pins and the ffi gem.

Summary

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Additional Context

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• [ ] Root cause and the steps to reproduce. (If applicable)
• [ ] Thought process behind the implementation.

Related Issues (if any)

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Checklist

• [ ] 🟢 Spec tests.
• [ ] 🟢 Acceptance tests.
• [ ] Manually verified.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (main@55177e6). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #365 +/- ## ======================================= Coverage ? 11.69% ======================================= Files ? 92 Lines ? 11499 Branches ? 0 ======================================= Hits ? 1345 Misses ? 10154 Partials ? 0 ```

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