Refresh compliance suite acceptance nodesets

[silug]

Summary

The compliance suite's beaker nodesets in `spec/acceptance/suites/compliance/nodesets/` are out of date relative to the rest of the module.

Evidence

After PR #238 deletes the EOL `amzn2.yml` and `centos8.yml` from this directory, the remaining files are:

• `default.yml` — still targets CentOS 7 (`box: centos/7`, `platform: el-7-x86_64`, `puppet_collection: puppet7`). EL7 was dropped in 9.0.0.
• `centos9.yml` — almost certainly also stale (`puppet7` default, possibly other drift), but at least the platform is supported.

The main suite's nodesets (`spec/acceptance/nodesets/`) were brought current as part of the EL10/openvox8 cleanup; this directory was missed.

Proposed Fix

• Replace `default.yml` with an EL10 + `openvox8` target consistent with `spec/acceptance/nodesets/default.yml`.
• Update `centos9.yml` (and consider whether to add full per-distro coverage matching the main suite — but per project convention, vagrant nodesets should be limited to one or two representatives, so a single `default.yml` may be sufficient).
• Decide whether the compliance suite is still being run in CI. If not, this directory may be removable entirely.

Definition of Done

Compliance-suite nodesets target a currently-supported OS and default to `openvox8`, or the directory is removed if the suite is no longer maintained.