The ECS-related data dependencies of the system.
Before SystemBase.OnUpdate or ISystem.OnUpdate, the Dependency property represents the combined job handles of any job that
writes to the same components that the current system reads -- or reads the same components that the current
system writes to.
The [JobHandle] objects of any jobs scheduled with explicit dependencies are not combined with
the system’s Dependency property. You must set the Dependency property manually to make sure
that later systems receive the correct job dependencies.
[JobHandle]: https://docs.unity3d.com/ScriptReference/Unity.Jobs.JobHandle.html
Additional resources: SystemBase.Dependency