Chore(deps): Update polars[pyarrow] requirement from <1.2 to <1.9

Updates the requirements on [polars[pyarrow]](https://github.com/pola-rs/polars) to permit the latest version.
- [Release notes](https://github.com/pola-rs/polars/releases)
- [Commits](pola-rs/polars@py-0.0.1...py-1.8.2)

---
updated-dependencies:
- dependency-name: polars[pyarrow]
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -78,7 +78,7 @@ optional-dependencies.release = [
 ]
 optional-dependencies.test = [
   "pandas<2.3",
-  "polars[pyarrow]<1.2",
+  "polars[pyarrow]<1.9",
   "pytest<9",
   "pytest-asyncio<1",
   "pytest-cov<6",