Update polars requirement from <1.18 to <1.19

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-1.18.0)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -114,7 +114,7 @@ all = [
 ]
 cfr = [
   "pandas<2.3",
-  "polars<1.18",
+  "polars<1.19",
   "pyarrow<18.2",
 ]
 cloud = [
@@ -157,7 +157,7 @@ io = [
   "dask[dataframe]>=2020",
   "fsspec[s3,http]",
   "pandas<2.3,>=1",
-  "polars<1.18",
+  "polars<1.19",
   "sqlalchemy>=2",
   "universal-pathlib<0.3",
 ]