Ignore new lint as workaround

Author: stinodego

crates/polars-python/src/exceptions.rs

@@ -1,5 +1,9 @@
 //! Define the Polars exception hierarchy.
 
+// TODO: Remove this directive when linked issue is fixed.
+// https://github.com/PyO3/pyo3/issues/4743
+#![allow(unexpected_cfgs)]
+
 use pyo3::create_exception;
 use pyo3::exceptions::{PyException, PyWarning};