build(deps): update polars requirement from ~=1.17.0 to ~=1.18.0

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-1.17.0...py-1.18.0)

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

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

pyproject.toml

@@ -20,7 +20,7 @@ isd = "isd.cli:main"
 dev = ["mypy~=1.2", "pre-commit~=4.0", "pytest~=8.0", "ruff~=0.8.0"]
 examples = ["tqdm~=4.66"]
 docs = ["sphinx~=8.0"]
-polars = ["polars~=1.17.0"]
+polars = ["polars~=1.18.0"]
 pandas = ["pandas~=2.0"]
 
 [build-system]