fix polars dep lb

[FBumann]

Fix polars lb for streaming engine being set too low. The new streaming engine was introduced in 1.31.1

Checklist

• Code changes are sufficiently documented; i.e. new functions contain docstrings and further explanations may be given in doc.
• Unit tests for new features were added (if applicable).
• A note for the release notes doc/release_notes.rst of the upcoming release is included.
• I consent to the release of this PR's code under the MIT license.