Update polars requirement from <1.5 to <1.6

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@py-0.0.1...py-1.5.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -92,7 +92,7 @@ dependencies = [
   "cratedb-sqlparse==0.0.6",
   'importlib-metadata; python_version < "3.8"',
   'importlib-resources; python_version < "3.9"',
-  "polars<1.5",
+  "polars<1.6",
   "python-dateutil<3",
   "python-dotenv<2",
   "python-slugify<9",