Fix version guards in tests for set sorted hints

[Matt711]

Description

Fix nightly tests https://github.com/NVIDIA/cudf/actions/runs/32106621381/job/95617300260#step:13:4850

FAILED tests/expressions/test_agg.py::test_agg[no_nulls-min-Int32-sorted-in-memory] - polars.exceptions.ComputeError: 'cuda' conversion failed: NotImplementedError: ('Query execution with GPU not possible: unsupported operations.\nThe errors were:\n- NotImplementedError: hint ir', [NotImplementedError('hint ir')])
FAILED tests/expressions/test_agg.py::test_agg[no_nulls-min-Int32-sorted-dask] - polars.exceptions.ComputeError: 'cuda' conversion failed: NotImplementedError: ('Query execution with GPU not possible: unsupported operations.\nThe errors were:\n- NotImplementedError: hint ir', [NotImplementedError('hint ir')])
FAILED tests/expressions/test_agg.py::test_agg[nulls-min-Int32-sorted-spmd-small] - polars.exceptions.ComputeError: 'cuda' conversion failed: NotImplementedError: ('Query execution with GPU not possible: unsupported operations.\nThe errors were:\n- NotImplementedError: hint ir', [NotImplementedError('hint ir')])

• Follows up In-memory support for set_sorted/MapFunction("hint_sorted") #23663

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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[Matt711]

/ok to test 61bfc3f

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📥 Commits

Reviewing files that changed from the base of the PR and between a98ad61 and 61bfc3f.

📒 Files selected for processing (2)

• python/cudf_polars/tests/expressions/test_agg.py
• python/cudf_polars/tests/test_mapfunction.py

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📝 Walkthrough

Summary by CodeRabbit

• Tests
  • Updated compatibility handling for Polars versions before 1.38.
  • Adjusted sorted-data and sorted-join test expectations for unsupported sorting hints in older Polars releases.

Walkthrough

The changes update Polars version checks in aggregation and map-function tests. Sorted tests now use the <1.38 compatibility threshold, and the aggregation test records the unsupported set_sorted hint IR as its expected-failure reason.

Changes

Polars compatibility

Layer / File(s)	Summary
Sorted test compatibility python/cudf_polars/tests/expressions/test_agg.py, python/cudf_polars/tests/test_mapfunction.py	Updated version imports and expected-failure conditions for sorted-data and sorted-join tests. The aggregation test now cites unsupported set_sorted hint IR.
Estimated code review effort: 1 (Trivial)	~5 minutes

Merge Risk: ⚪ Minimal · up to 61bfc

This PR makes a localized test-only change to version guards for sorted hints; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: mroeschke, madsbk, rjzamora

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: correcting version guards for tests involving sorted hints.
Description check	✅ Passed	The description explains the nightly test failures, the unsupported operation, and the follow-up change.
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.

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[Matt711]

/merge