chore(deps): bump mlx[cuda] from 0.28.0 to 0.29.3 in /cmd/runtimes/mlx (#2956)

Bumps [mlx[cuda]](https://github.com/ml-explore/mlx) from 0.28.0 to 0.29.3.
- [Release notes](https://github.com/ml-explore/mlx/releases)
- [Commits](ml-explore/mlx@v0.28.0...v0.29.3)

---
updated-dependencies:
- dependency-name: mlx[cuda]
  dependency-version: 0.29.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

cmd/runtimes/mlx/requirements.txt

@@ -1,5 +1,5 @@
 # MLX libraries.
-mlx[cuda]==0.28.0
+mlx[cuda]==0.29.4
 mlx-data==0.1.0
 mlx-lm==0.26.3
 # HuggingFace libraries.