[executorch][mlx] bump MLX version to v0.32

[metascroy]

As titled

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20970

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❌ 1 New Failure, 57 Pending

As of commit e4b22b3 with merge base e16c048 ():

NEW FAILURE - The following job has failed:

• MLX / backend-tester (models) / test-mlx-backend-models (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

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