Update MLUtils requirement to 0.4.9 in /docs (#20)

Updates the requirements on [MLUtils](https://github.com/JuliaML/MLUtils.jl) to permit the latest version.
- [Release notes](https://github.com/JuliaML/MLUtils.jl/releases)
- [Commits](JuliaML/MLUtils.jl@v0.1.0...v0.4.9)

---
updated-dependencies:
- dependency-name: MLUtils
  dependency-version: 0.4.9
  dependency-type: direct:production
...

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docs/Project.toml

@@ -10,4 +10,5 @@ Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 [compat]
 Documenter = "1.17.0"
 Flux = "0.16.10"
+MLUtils = "0.4.9"
 Plots = "1.41.6"