Last 3.15 changes

[mdboom]

Some last straggling changes related to Python 3.15 support from this review comment:
#3113 (review)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Reviewing files that changed from the base of the PR and between c5f8bd6 and 48a939c.

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• ci/test-matrix.yml

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📝 Summary

Summary by CodeRabbit

• Tests
  • Expanded Linux and Windows test coverage to Python 3.15 and free-threaded 3.15t across CUDA 12.9.1 and 13.4.2 configurations, including additional GPU and Windows driver-mode combinations.
  • Updated NumPy and ml-dtypes test requirements to allow newer compatible releases; ml-dtypes is now required across supported environments.

The pull-request matrix adds Python 3.15 and 3.15t coverage on Linux and Windows. The NumPy and ml-dtypes test dependencies no longer have their previous upper bounds or environment exclusions.

Changes: Python 3.15 Testing

Layer / File(s)	Summary
Test dependency constraints cuda_bindings/pyproject.toml, cuda_core/pyproject.toml	NumPy retains its >=1.21.1 minimum without an upper bound. ml-dtypes retains its >=0.5.4 minimum without an upper bound or environment marker.
Linux and Windows test matrix ci/test-matrix.yml	The Linux matrix adds Python 3.15 and 3.15t rows on amd64 and arm64. The Windows matrix adds Python 3.15 and 3.15t rows for CUDA 12.9.1 and 13.4.2, with specified GPU and driver-mode configurations.

Suggested reviewers: leofang

Priority: ➖ Normal

Change: Other

Merge Risk: ⚪ Minimal · up to 48a93

The expanded test matrix and dependency changes have compatible package distributions for the newly covered environments, and the earlier requested matrix row is present. No concrete merge-blocking issue is established; normal CI validation remains appropriate.

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✨ Finishing Touches: 💡 1

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[github-actions]

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[leofang]

thanks, Mike, not sure why we missed this, but the same expansion should be applied to linux-aarch64 and win-64 too

[leofang]

Thanks, Mike!