Update DecisionFocusedLearningBenchmarks requirement to 0.6.0 in /test (#85)

Updates the requirements on [DecisionFocusedLearningBenchmarks](https://github.com/JuliaDecisionFocusedLearning/DecisionFocusedLearningBenchmarks.jl) to permit the latest version.
- [Release notes](https://github.com/JuliaDecisionFocusedLearning/DecisionFocusedLearningBenchmarks.jl/releases)
- [Commits](v0.1.0...v0.6.0)

---
updated-dependencies:
- dependency-name: DecisionFocusedLearningBenchmarks
  dependency-version: 0.6.0
  dependency-type: direct:production
...

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test/Project.toml

@@ -22,5 +22,6 @@ DecisionFocusedLearningBenchmarks = {path = ".."}
 
 [compat]
 Aqua = "0.8.14"
+DecisionFocusedLearningBenchmarks = "0.6.0"
 JuliaFormatter = "2"
 Test = "1"