fix(python): Update apply call in str_duration_ util. (pola-rs#16412

)

py-polars/polars/_utils/various.py

@@ -307,7 +307,7 @@ def str_duration_(td: str | None) -> int | None:
             elif tp == Duration:
                 cast_cols[c] = (
                     F.col(c)
-                    .apply(str_duration_, return_dtype=Int64)
+                    .map_elements(str_duration_, return_dtype=Int64)
                     .cast(Duration("ns"))
                     .cast(tp)
                 )