Add __iter__ to Row to declare it as iterable (#1148)

avoids typing warnings on iter()-like operations, e.g. zip(), etc.

src/pyodbc.pyi

@@ -925,6 +925,7 @@ class Row:
     def __getattribute__(self, name, /) -> Any: ...
     def __getitem__(self, key, /) -> Any: ...
     def __gt__(self, value, /) -> bool: ...
+    def __iter__(self) -> Iterator[Any]: ...
     def __le__(self, value, /) -> bool: ...
     def __len__(self, /) -> int: ...
     def __lt__(self, value, /) -> bool: ...