try fix typing

jorisvandenbossche · jorisvandenbossche · commit bf02000a5aec · 2024-09-02T08:54:02.000+02:00
diff --git a/pandas/core/arrays/_arrow_string_mixins.py b/pandas/core/arrays/_arrow_string_mixins.py
@@ -27,9 +27,12 @@
         Self,
     )
 
+    from pandas.core.dtypes.dtypes import ExtensionDtype
+
 
 class ArrowStringArrayMixin:
     _pa_array: Sized
+    dtype: ExtensionDtype
 
     def __init__(self, *args, **kwargs) -> None:
         raise NotImplementedError
