Update src/ClusterSequence.jl

Ensure that jet and ClusterSequence have the same type

Co-authored-by: Mateusz Jakub Fila <[email protected]>

Author: graeme-a-stewart

src/ClusterSequence.jl

@@ -638,7 +638,7 @@ function has_parents(p::FourMomentum,
 end
 
 """
-    parent_jets(jet::T, cs::ClusterSequence)::Tuple{Union{Nothing, T}, Union{Nothing, T}} where {T <: FourMomentum}
+    parent_jets(jet::T, cs::ClusterSequence{T})::Tuple{Union{Nothing, T}, Union{Nothing, T}} where {T <: FourMomentum}
 
 Find the parent jets of a given jet in a cluster sequence.
 
@@ -651,7 +651,7 @@ A tuple of two elements, each of which is either the parent jet object or
 `nothing` (if the jet has no parent).
 """
 function parent_jets(jet::T,
-                     cs::ClusterSequence)::Tuple{Union{Nothing, T},
+                     cs::ClusterSequence{T})::Tuple{Union{Nothing, T},
                                                  Union{Nothing, T}} where {T <:
                                                                            FourMomentum}
     hist_idx = jet._cluster_hist_index