Plenary is about to be archived #51

As per the upstream:

This repository is no longer actively maintained and will be officially archived soon.
Critical bugs may still be addressed until 2026-06-30
No new features will be added
Ongoing support should not be expected

Quick check of the codebase reveals only two modules in use:

1. plenary.async
2. plenary.path

Would it be feasible to replace/vendor-in those?

Ping @AbaoFromCUG