chore(deps): Update polars requirement from 0.38.1 to 0.39.2

Updates the requirements on [polars](https://github.com/pola-rs/polars) to permit the latest version.
- [Release notes](https://github.com/pola-rs/polars/releases)
- [Commits](pola-rs/polars@rs-0.38.1...rs-0.39.2)

---
updated-dependencies:
- dependency-name: polars
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -39,7 +39,7 @@ thiserror = "1.0.25"
 num = "0.4.0"
 float-cmp = "0.9.0"
 ndarray = "0.15.3"
-polars = { version = "0.38.1", features = ["lazy", "rows", "ndarray"] }
+polars = { version = "0.39.2", features = ["lazy", "rows", "ndarray"] }
 pyo3-polars = "0.13"
 pyo3 = { version = "0.21", default-features = false }
 pyo3-log = "0.10"