Update Flux requirement to 0.16.10 in /test (#92)

Updates the requirements on [Flux](https://github.com/FluxML/Flux.jl) to permit the latest version.
- [Release notes](https://github.com/FluxML/Flux.jl/releases)
- [Changelog](https://github.com/FluxML/Flux.jl/blob/master/NEWS.md)
- [Commits](FluxML/Flux.jl@v0.1.0...v0.16.10)

---
updated-dependencies:
- dependency-name: Flux
  dependency-version: 0.16.10
  dependency-type: direct:production
...

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test/Project.toml

@@ -24,6 +24,7 @@ DecisionFocusedLearningBenchmarks = {path = ".."}
 Aqua = "0.8.14"
 DecisionFocusedLearningBenchmarks = "0.6.0"
 Documenter = "1.17.0"
+Flux = "0.16.10"
 JuliaFormatter = "2"
 Plots = "1.41.6"
 StableRNGs = "1.0.4"