fix wrester argument type

services/workflow/workflow/server.py

@@ -90,6 +90,7 @@ def lookup_file(request: Request) -> WorkflowRequestFile:
     :param request: an HTTP request
     :return: a WorkflowRequestFile object containing filename and file content for this request, if any
     """
+
     for file in lookup_request(request).files:
         if file.filename == request.matchdict["filename"]:
             return file