[XLA:Python] Correct type signature for xla_client.make_gpu_client.
[XLA:Python] Correct type signature for xla_client.make_gpu_client.

The type stub was stale and no longer matches the code.

Found as a presubmit failure while working on https://github.com/google/jax/pull/11390

PiperOrigin-RevId: 459395289

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