Backport fixes

Author: WillAyd

pandas/core/indexes/base.py

@@ -23,7 +23,7 @@
 from pandas._config import (
     get_option,
     using_copy_on_write,
-    using_pyarrow_string_dtype,
+    using_string_dtype,
 )
 
 from pandas._libs import (
@@ -7015,7 +7015,7 @@ def insert(self, loc: int, item) -> Index:
 
         out = Index._with_infer(new_values, name=self.name)
         if (
-            using_pyarrow_string_dtype()
+            using_string_dtype()
             and is_string_dtype(out.dtype)
             and new_values.dtype == object
         ):