chore: Bump polars to v1.39

[Copilot]

• Update pixi.toml to set polars-latest to 1.39.*
• Run pixi update to regenerate lock file (polars 1.38.1 → 1.39.2)
• Fix test_repr_collection - polars 1.39 changed plan repr format from PROJECT["a"] 1/1 COLUMNS to PROJECT */1 COLUMNS
• Skip test_repr_collection for polars < 1.39 using _polars_version_tuple runtime check
• All 2655 tests pass

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (4adee6f) to head (291a870).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #299   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           54        54           
  Lines         3127      3127           
=========================================
  Hits          3127      3127           

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[Oliver Borchert (borchero)]

Copilot skip the test that currently fails for polars-minimal whenever the polars version is not >=1.39. Investigate the codebase for how to do runtime version checks.

[Copilot]

Copilot skip the test that currently fails for polars-minimal whenever the polars version is not >=1.39. Investigate the codebase for how to do runtime version checks.

Added a pytest.mark.skipif using _polars_version_tuple from dataframely._compat to skip the test when polars < 1.39. See 291a870.

[Copilot]

Pull request overview

Updates the repository’s “latest polars” environment to polars 1.39 and aligns a Collection repr test with polars 1.39’s query plan formatting changes.

Changes:

• Bump feature.polars-latest in pixi.toml from 1.38.* to 1.39.*.
• Regenerate pixi.lock to pin polars (and runtimes) to 1.39.2 across platforms.
• Adjust test_repr_collection expected output for polars 1.39 and add a version gate.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/collection/test_repr.py	Updates expected plan repr and adds a polars-version condition around the test.
pixi.toml	Bumps the “polars-latest” feature dependency constraint to 1.39.*.
pixi.lock	Updates locked artifacts to polars 1.39.2 / runtime 1.39.2 across platforms.

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