[py] Assign to private

Author: cgoldberg

py/selenium/webdriver/wpewebkit/service.py

@@ -46,7 +46,7 @@ def __init__(
         env: Optional[Mapping[str, str]] = None,
         **kwargs,
     ):
-        self.service_args = service_args or []
+        self._service_args = service_args or []
 
         super().__init__(
             executable_path=executable_path,