Build: Bump polars from 1.30.0 to 1.31.0

Bumps [polars](https://github.com/pola-rs/polars) from 1.30.0 to 1.31.0.
- [Release notes](https://github.com/pola-rs/polars/releases)
- [Commits](pola-rs/polars@py-1.30.0...py-1.31.0)

---
updated-dependencies:
- dependency-name: polars
  dependency-version: 1.31.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]