Bump mlx-swift-lm / mlx-swift

[noorbhatia]

Hey @mattt can we bump pinned MLX upstreams (mlx-swift-lm, mlx-swift) on a regular cadence so downstream consumers can pick up new models and fixes without hard-pinning revisions.

[noorbhatia]

@mattt

[noorbhatia]

@pcuenca can you help with this?

[pcuenca]

I can take a look.

Would you mind sharing what you're using the package for? Just curious!