ultralytics 8.0.232 OpenCV 4.9.0 readonly np.array fix (#7256)

ultralytics/utils/plotting.py

@@ -90,7 +90,7 @@ class Annotator:
             if check_version(pil_version, '9.2.0'):
                 self.font.getsize = lambda x: self.font.getbbox(x)[2:4]  # text width, height
         else:  # use cv2
-            self.im = im
+            self.im = im if im.flags.writeable else im.copy()
             self.tf = max(self.lw - 1, 1)  # font thickness
             self.sf = self.lw / 3  # font scale
         # Pose