Update DataStructures requirement from ^0.18.1, 0.19 to ^0.18.1, 0.19, 0.19

Updates the requirements on [DataStructures](https://github.com/JuliaCollections/DataStructures.jl) to permit the latest version.
- [Release notes](https://github.com/JuliaCollections/DataStructures.jl/releases)
- [Changelog](https://github.com/JuliaCollections/DataStructures.jl/blob/master/CHANGELOG.md)
- [Commits](https://github.com/JuliaCollections/DataStructures.jl/commits/v0.19.3)

---
updated-dependencies:
- dependency-name: DataStructures
  dependency-version: 0.19.3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Project.toml

@@ -15,7 +15,7 @@ GraphsColoringGraphs = ["Graphs"]
 
 [compat]
 Aqua = "0.8"
-DataStructures = "^0.18.1, 0.19"
+DataStructures = "^0.18.1, 0.19, 0.19"
 Graphs = "1"
 JLD2 = "0.6"
 JuliaFormatter = "2.1"