Bump polars from 1.38.1 to 1.39.2 in the prod-dependencies group

Bumps the prod-dependencies group with 1 update: [polars](https://github.com/pola-rs/polars).


Updates `polars` from 1.38.1 to 1.39.2
- [Release notes](https://github.com/pola-rs/polars/releases)
- [Commits](pola-rs/polars@py-1.38.1...py-1.39.2)

---
updated-dependencies:
- dependency-name: polars
  dependency-version: 1.39.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: prod-dependencies
...

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Author: dependabot[bot]