debci-scheduler: Schedule transitive dependencies?

Say gcc-13 changes. As a dependency of most or all ROCm packages, this will trigger a test for them.

However, are we content on testing the effects of this update on just the ROCm packages, or do we also want to trigger tests for their reverse dependencies, too?

It seems that good test coverage should catch any issues already at the ROCm level, but that is not a guarantee, and at the same time, this would be pretty easy to implement.