Guard xfail for polars test test_series_init_np_temporal_with_nat_15518 for NumPy>=2.5

[Matt711]

Description

Follow up to #23635. Adds a numpy version guard since it only fails for specific numpy versions.

Fixes nightly failures https://github.com/NVIDIA/cudf/actions/runs/32007604769/job/95320256201#step:13:1742

FAILED py-polars/tests/unit/constructors/test_series.py::test_series_init_np_temporal_with_nat_15518 - [XPASS(strict)] DeprecationWarning from Numpy: https://github.com/pola-rs/polars/pull/28782

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes

  • Improved compatibility testing for NumPy 2.5.0 and newer.
  • Version-specific expected failures are now recognized more accurately.

• Tests

  • Improved test collection and execution consistency when known compatibility issues occur.
  • Enhanced reporting of expected test outcomes across supported NumPy versions.

Walkthrough

The GPU engine test configuration registers a temporal-NaT constructor test as an expected failure for NumPy 2.5.0 and newer. It also uses a concrete dictionary annotation and simplifies expected-failure lookup.

Changes

NumPy expected-failure configuration

Layer / File(s)	Summary
Version-gated temporal test configuration python/cudf_polars/cudf_polars/testing/inject_gpu_engine.py	The module imports NumPy, updates EXPECTED_FAILURES to use dict[str, str], registers the temporal-NaT constructor test for NumPy 2.5.0 and newer, and simplifies the expected-failure lookup.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 38b11

This PR makes a localized NumPy-version guard for a Polars xfail; no actionable merge-blocking risk remains, so it is merge-ready after normal checks and review.

Suggested reviewers: bdice

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the guarded Polars test and the NumPy version condition.
Description check	✅ Passed	The description explains the NumPy version guard, the affected test, and the nightly failure it addresses.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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.

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Matt711]

/merge

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Actionable comments posted: 1

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Inline comments:
In `@python/cudf_polars/cudf_polars/testing/inject_gpu_engine.py`:
- Around line 355-363: Update coverage for the NumPy version gate around
EXPECTED_FAILURES.update: test versions below 2.5.0, exactly 2.5.0, and above
it, asserting the test node is registered only for versions at or above 2.5.0.

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[Matt711]

/ok to test 1a2c614

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