A section needs to be added to the 2.4.1 release notes  explaining how to upgrade from 2.4.0.
These PRs have all been merged. We don't have a readthedocs builder for our 2.4.1-dev branch, so QE will need to verify this by reading the docs directly from github. Here are links to the release notes for all three repos. Once we merge these to our release branch, readthedocs will be updated.
This is fixed in Pulp-2.4.1-1.