[MNT] [Dependabot](deps): Update polars requirement from <1.5.0 to <1…

….7.0 (#456)

Updates the requirements on [polars](https://github.com/pola-rs/polars)
to permit the latest version.

pyproject.toml

@@ -55,7 +55,7 @@ all_extras = [
     "mapie",
     "matplotlib>=3.3.2",
     "ngboost<0.6.0",
-    "polars<1.5.0",
+    "polars<1.7.0",
     "pyarrow<14.0.0; python_version < '3.12'",
     "scikit-survival<0.24.0",
     "statsmodels>=0.12.1",