Fix __iter__ return type to Iterator (#129)

Co-authored-by: Quentin Pradet <quentin.pradet@elastic.co>
(cherry picked from commit 6baac50)

elastic_transport/_response.py

@@ -19,7 +19,6 @@
     Any,
     Dict,
     Generic,
-    Iterable,
     Iterator,
     List,
     NoReturn,
@@ -107,8 +106,8 @@ def __setstate__(self, state: Tuple[_BodyType, ApiResponseMeta]) -> None:
     def __len__(self) -> int:
         return len(self._body)
 
-    def __iter__(self) -> Iterable[Any]:
-        return iter(self._body)  # type: ignore[no-any-return]
+    def __iter__(self) -> Iterator[Any]:
+        return iter(self._body)
 
     def __str__(self) -> str:
         return str(self._body)
@@ -134,7 +133,7 @@ def raw(self) -> _BodyType:
 class TextApiResponse(ApiResponse[str]):
     """API responses which are text such as 'text/plain' or 'text/csv'"""
 
-    def __iter__(self) -> Iterable[str]:
+    def __iter__(self) -> Iterator[str]:
         return iter(self.body)
 
     def __getitem__(self, item: Union[int, slice]) -> str:
@@ -148,7 +147,7 @@ def body(self) -> str:
 class BinaryApiResponse(ApiResponse[bytes]):
     """API responses which are a binary response such as Mapbox vector tiles"""
 
-    def __iter__(self) -> Iterable[int]:
+    def __iter__(self) -> Iterator[int]:
         return iter(self.body)
 
     @overload
@@ -214,7 +213,7 @@ def __getitem__(
     ) -> Union[_ListItemBodyType, List[_ListItemBodyType]]:
         return self.body[item]
 
-    def __iter__(self) -> Iterable[_ListItemBodyType]:
+    def __iter__(self) -> Iterator[_ListItemBodyType]:
         return iter(self.body)
 
     @property