[zelphirkalt]

It is very easy to build this yourself. Just use your dependency manager of choice that has git support and create a config of versions of the repos and lock file that. Whenever you have a change across multiple services, simply change that config in one go, so that every commit of that config describes a deployable state of the whole project.

[williamdclt]

I might be misunderstanding but that seems off-topic, not related to the idea of "multi-repository pull requests"