v0.19.4

DataStructures v0.19.4

Diff since v0.19.3

Merged pull requests:

• Fix MutableBinaryHeap{T} when T is Union/abstract (#869) (@cmcaine)
• Bump actions/checkout from 5 to 6 (#962) (@dependabot[bot])
• release 0.19.3 (#964) (@oxinabox)
• Bump julia-actions/cache from 2 to 3 (#965) (@dependabot[bot])
• feat: implement Base.in for IntDisjointSet and DisjointSet (#966) (@AayushSabharwal)

Closed issues:

• MutableBinaryHeap doesn't work with Abstract / Union Type (#963)