Call the function :-)

Fixes #13330

lib/ansible/module_utils/basic.py

@@ -213,7 +213,7 @@ except ImportError:
             elif isinstance(node, ast.List):
                 return list(map(_convert, node.nodes))
             elif isinstance(node, ast.Dict):
-                return dict((_convert(k), _convert(v)) for k, v in node.items)
+                return dict((_convert(k), _convert(v)) for k, v in node.items())
             elif isinstance(node, ast.Name):
                 if node.name in _safe_names:
                     return _safe_names[node.name]