The OpenAL Soft website refers to a more up-to-date repo at: https://github.com/kcat/openal-soft.
The workflow currently downloads the 1.21.1 release.
The binaries are artifacts from the workflow.
The hope is someday these can be offered as a package in Silk.NET.
I was building a cross platform .NET application, and after having it work fine on MacOS, I realized Windows does not have OpenAL binaries installed.
As a developer, I just wanted to include Silk.NET as a dependency and have it just work.