Last 3.15 changes

[mdboom]

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

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📥 Commits

Reviewing files that changed from the base of the PR and between 166cd5a and 1f16767.

📒 Files selected for processing: 3

• ci/test-matrix.yml
• cuda_bindings/pyproject.toml
• cuda_core/pyproject.toml

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📝 Summary

Summary by CodeRabbit

• Tests
  • Expanded Linux CI coverage to include Python 3.15 with CUDA 12.9.1 and an L4 GPU.
  • Updated test dependency version constraints to allow newer compatible releases and resolve across environments.
  • These updates broaden automated testing coverage and flexibility; they do not change application behavior.

The Linux pull-request matrix adds an amd64 Python 3.15 job. 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
Python 3.15 test coverage and dependency resolution ci/test-matrix.yml, cuda_bindings/pyproject.toml, cuda_core/pyproject.toml	The CI matrix adds an amd64 Python 3.15 job with CUDA 12.9.1, non-local CTK, one L4 GPU, and the latest driver. The NumPy dependency keeps its >=1.21.1 minimum without an upper bound. The ml-dtypes dependency keeps its >=0.5.4 minimum without an upper bound or environment marker.

Suggested reviewers: leofang

Priority: ⬇️ Low

Change: Feature

Merge Risk: ⚪ Minimal · up to 1f167

The Python 3.15 test and dependency changes show no demonstrated merge-blocking failure; the PR appears mergeable after normal checks.

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[leofang]

would be better if we also convert 3.15t + CUDA 12.9

[leofang]

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