What is the intended workflow for the Dependabot PRs?

Hi, just testing this action - thanks for it!

Something that is unclear to me is the intended workflow for Dependabot PRs once the combined PR is opened/merged. Is the idea that the individual Dependabot PRs should be manually closed? I was expecting this action to close individual PRs once they've been added to the combined PR, but this doesn't seem to be the case, and I can't see anything in the code to suggest it should do this either.

If not, should we add this? It seems less helpful to do the work of raising a combined PR if manual action on the individual PRs is still required.