Switching the release name from 601.0.0 to Swift 6.1.1 Release unnecessarily complicates things:
Arch Linux's "pkgctl version check" doesn't recognize the new release as it depends on the release starting with a number like 601 or simple prefixes like v601 that can be ignored.
I tried a few solutions (version-check.yaml, custom type, package-version.json, ...) and nothing works.
So please re-release with proper naming!
See for example:
https://github.com/RenderKit/embree/releases/tag/v4.4.0