`artifact_location` default is not being set

[pebeto]

Referencing JuliaAI/MLJFlow.jl#42

[pebeto]

The last version of MLFlowClient.jl (v0.8.0) pairs with mlflow==3.11.1, which means that the artifact endpoints are now officially accessible via the REST API. Functions to perform operations with artifacts were set in the artifact service.