Prepare 2.7.3 release (PaddlePaddle#11826)

* fix: Correct misuse of `try_import` from `paddle.utils` (PaddlePaddle#11820)

This commit addresses the incorrect usage of the `try_import` function from `paddle.utils` in both `ppocr/utils/utility.py` and `ppstructure/pdf2word/pdf2word.py`.

* bump version to 2.7.3

---------

Co-authored-by: NeterOster <neteroster@gmail.com>

Author: jzhang533

ppocr/utils/utility.py

@@ -108,7 +108,8 @@ def check_and_read(img_path):
         return imgvalue, True, False
     elif os.path.basename(img_path)[-3:].lower() == 'pdf':
         from paddle.utils import try_import
-        try_import('fitz')
+
+        fitz = try_import("fitz")
         from PIL import Image
         imgs = []
         with fitz.open(img_path) as pdf:

ppstructure/pdf2word/pdf2word.py

@@ -21,9 +21,9 @@
 import cv2
 import platform
 import numpy as np
-import fitz
 from paddle.utils import try_import
-try_import('fitz')
+fitz = try_import("fitz")
+
 from PIL import Image
 from pdf2docx.converter import Converter
 from qtpy.QtWidgets import QApplication, QWidget, QPushButton, QProgressBar, \