Update TaskState documentation about dependents attribute #4440
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I think this mechanism should be refined but currently
dependents
is a dynamic data structure and this should be reflected in the docs.For dependencies we have already a dynamic equivalent with
waiting_for_data
and I believe we should establish a similar mechanism for the dependents since this is primarily used to determine whether or not a key is allowed to be forgotten. In the meantime, a more accurate docstring should helpxref #4413