Argument 2 to "upload" of "WorkspaceExt" has incompatible type "bytes"; expected "BinaryIO"  [arg-type]

Add union type for upload method, as the current way still works
```
        info = json.dumps(workspaces, indent=2).encode("utf8")
        ...
            self._ws.workspace.upload(path, info, overwrite=True, format=ImportFormat.AUTO)
```