We have been including SFMC via SPM in our projects. Version 8.0.9 was released recently, but our projects, which are configured to automatically pick up these minor updates, have not picked this update up.
Looking at the repository, SPM package information is in the branch "spm" not the master branch, which is the default. There was nothing in the documentation to indicate that we need to use the spm branch instead of the default. Did someone forget to merge the branch, was the master made default by mistake, or was there a planned change to use the spm branch for publishing the SDK via SPM?
Most of the documentation regarding installing the SDK is out of date. We have followed the documentation for SPM we have found, and there is no indication we should be using a specific branch there, which leads me to believe that default branch was changed or a merge was missed.