chore(deps): bump datasets from 4.4.1 to 4.8.4 in /cmd/runtimes/mlx

Bumps [datasets](https://github.com/huggingface/datasets) from 4.4.1 to 4.8.4.
- [Release notes](https://github.com/huggingface/datasets/releases)
- [Commits](huggingface/datasets@4.4.1...4.8.4)

---
updated-dependencies:
- dependency-name: datasets
  dependency-version: 4.8.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

cmd/runtimes/mlx/requirements.txt

@@ -3,4 +3,4 @@ mlx[cuda]==0.30.0
 mlx-data==0.1.0
 mlx-lm==0.28.3
 # HuggingFace libraries.
-datasets==4.4.1
+datasets==4.8.4