allow image_type and method to accept str

Author: zen-xu

rustworkx/visualization/graphviz.pyi

@@ -62,8 +62,8 @@ def graphviz_draw(
     edge_attr_fn: typing.Callable[[_T], dict[str, str]] | None = ...,
     graph_attr: dict[str, str] | None = ...,
     filename: None = ...,
-    image_type: _ImageType | None = ...,
-    method: _Method | None = ...,
+    image_type: _ImageType | str | None = ...,
+    method: _Method | str | None = ...,
 ) -> Image: ...
 @typing.overload
 def graphviz_draw(
@@ -72,6 +72,6 @@ def graphviz_draw(
     edge_attr_fn: typing.Callable[[_T], dict[str, str]] | None = ...,
     graph_attr: dict[str, str] | None = ...,
     filename: str = ...,
-    image_type: _ImageType | None = ...,
-    method: _Method | None = ...,
+    image_type: _ImageType | str | None = ...,
+    method: _Method | str | None = ...,
 ) -> None: ...