Update requirements.txt to ultralytics 8.0.145 (#11920)

utils/__init__.py

@@ -54,7 +54,7 @@ def notebook_init(verbose=True):
     import os
     import shutil
 
-    from ultralytics.yolo.utils.checks import check_requirements
+    from ultralytics.utils.checks import check_requirements
 
     from utils.general import check_font, is_colab
     from utils.torch_utils import select_device  # imports