Update onnxruntime tests

[jcrist]

• Re-enable tests on Python 3.14, onnx now ships packages for this python version
• Gate RandomForestClassifier xfail to apply only to onnxruntime < 1.28.0

This should fix the failures seen in the nightlies last night (link). The latest onnxruntime version was just released on conda-forge, triggering the failures.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between 342457b and 0771e39.

📒 Files selected for processing (3)

• dependencies.yaml
• python/cuml/cuml_accel_tests/test_onnx.py
• python/cuml/pyproject.toml

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes

  • Improved ONNX Runtime compatibility across supported Python environments.
  • Updated Random Forest ONNX tests to account for behavior differences between ONNX Runtime versions.

• Tests

  • ONNX-related test dependencies are now consistently available in test environments.
  • Newer ONNX Runtime versions can run the relevant test without an unnecessary expected-failure marker.

Walkthrough

The change enables onnxruntime and skl2onnx for tests. The ONNX Runtime version now controls the expected-failure marker for the RandomForestClassifier test.

Changes

ONNX test dependency and version gating

Layer / File(s)	Summary
Enable ONNX test dependencies dependencies.yaml, python/cuml/pyproject.toml	The shared and project-specific test dependency sets include onnxruntime and skl2onnx.
Gate the ONNX expected failure python/cuml/cuml_accel_tests/test_onnx.py	The test records the installed ONNX Runtime version and applies the expected-failure marker only when the version is below 1.28.0.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: bdice, csadorf

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change to ONNX Runtime tests.
Description check	✅ Passed	The description accurately explains the Python 3.14 test changes and ONNX Runtime version gating.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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