Fix #1051: Make _graph.py compatible with cuda-python==12.6.* and fix tests

[mdboom]

There were two independent issues here:

• The driver.CUgraphInstantiateResult.CUDA_GRAPH_INSTANTIATE_CONDITIONAL_HANDLE_UNUSED enum was added in CUDA 12.8, so we can't handle it as a result type on earlier versions

• There are a number of features not supported on 12.6, and they are getting properly gated, if the driver supports the feature and the bindings don't, the exception raised will say Bindings version (12, 6) does not support X rather than Driver version (12, 6) does not support X. For these I have just updated the tests to accept either string.

I have confirmed this makes the tests pass in a local venv where I have installed cuda-python==12.6.2-post1 and a local checkout of cuda_core. However, I don't think this is exercised in our CI. Should we add that?

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[mdboom]

/ok to test

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Pull Request Overview

This PR fixes compatibility issues with cuda-python 12.6.* by addressing two independent problems: adding version checks for CUDA 12.8-specific enums and updating test patterns to accept both driver and binding version error messages.

• Adds version check for CUDA_GRAPH_INSTANTIATE_CONDITIONAL_HANDLE_UNUSED enum (available only in CUDA 12.8+)
• Updates test assertions to accept error messages from either driver or binding version checks

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
cuda_core/cuda/core/experimental/_graph.py	Adds binding version check before accessing CUDA 12.8-specific enum to prevent AttributeError on earlier versions
cuda_core/tests/test_graph.py	Updates regex patterns in test assertions to match both "Driver version" and "Binding version" error messages

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