PR #10433: Fixes type annotation overload of `dlpack_managed_tensor_to_buffer` in `python/xla_extension` 
PR #10433: Fixes type annotation overload of `dlpack_managed_tensor_to_buffer` in `python/xla_extension` 

Imported from GitHub PR https://github.com/openxla/xla/pull/10433

Encountered bug in https://github.com/google/jax/pull/20175 (see this [comment](https://github.com/google/jax/pull/20175#issuecomment-1989572870)).

This adjusts the stub file to properly overload `dlpack_managed_tensor_to_buffer` so that both signatures can be checked against.
Copybara import of the project:

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75cabb5149b4a0bdd9e819fac0ea6a0ba756bff6 by Meekail Zain <zainmeekail@gmail.com>:

Update

Merging this change closes #10433

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10433 from Micky774:type_update 75cabb5149b4a0bdd9e819fac0ea6a0ba756bff6
