refactor: no need to inherit in python3 clean the code (#5659)

### What problem does this PR solve?

As title

### Type of change


- [x] Refactoring

Signed-off-by: yihong0618 <zouzou0208@gmail.com>

deepdoc/vision/recognizer.py

@@ -28,7 +28,7 @@ from .operators import preprocess
 from . import operators
 from .ocr import load_model
 
-class Recognizer(object):
+class Recognizer:
     def __init__(self, label_list, task_name, model_dir=None):
         """
         If you have trouble downloading HuggingFace models, -_^ this might help!!