Use Forward from the module it is defined from (#293)

`Base.Order` defines `Forward` and `Base.Sort` uses it.

src/SparseArrays.jl

@@ -7,7 +7,7 @@ module SparseArrays
 
 using Base: ReshapedArray, promote_op, setindex_shape_check, to_shape, tail,
     require_one_based_indexing, promote_eltype
-using Base.Sort: Forward
+using Base.Order: Forward
 using LinearAlgebra
 using LinearAlgebra: AdjOrTrans, matprod