Update DecisionFocusedLearningBenchmarks requirement to 0.6.0 in /docs (#80)

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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docs/Project.toml

@@ -7,5 +7,6 @@ Literate = "98b081ad-f1c9-55d3-8b20-4c87d4299306"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 
 [compat]
+DecisionFocusedLearningBenchmarks = "0.6.0"
 Documenter = "1.17.0"
 InferOpt = "0.7.2"