CI test fails with Polars 1.29.0: test_filter_metadata_state_name

[bsweger]

Background

When bumping Polars to 1.29.0 in a recent Cladetime dependency update, test_filter_metadata_state_name failed when running the test suite via GitHub actions (after a successful local test run on MacOS)

Failed GitHub actions run: https://github.com/reichlab/cladetime/actions/runs/15080851696

Definition of done

Determine the root cause of the failure:

• update the code so the failing test works on Polars 1.29.0 OR
• wait for Polars 1.29.1 to see if fixes the issues (we've had issues with their .0 release before)

Related: #95

[zkamvar]

I've told dependabot to ignore the minor version of polars for now: #150 (comment)