Fix typing

Author: hombit

src/nested_pandas/series/accessor.py

@@ -115,7 +115,7 @@ def to_flat(self, fields: list[str] | None = None) -> pd.DataFrame:
         return pd.DataFrame(flat_series)
 
     @property
-    def list_lengths(self) -> np.ndarray:
+    def list_lengths(self) -> list[int]:
         """Lengths of the list arrays"""
         return self._series.array.list_lengths