Update polars requirement from 0.31.1 to 0.32.1

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](https://github.com/pola-rs/polars/commits)

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

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

Cargo.toml

@@ -59,7 +59,7 @@ r2d2 = { version = "0.8.9", optional = true }
 calamine = { version = "0.21.0", optional = true }
 num = { version = "0.4", optional = true, default-features = false, features = ["std"] }
 duckdb-loadable-macros = { version = "0.1.0", path="./duckdb-loadable-macros", optional = true }
-polars = { version = "0.31.1", features = ["dtype-full"], optional = true}
+polars = { version = "0.32.1", features = ["dtype-full"], optional = true}
 
 [dev-dependencies]
 doc-comment = "0.3"