Fixes :

test_goodFeaturesToTrack (test_goodfeatures.TestGoodFeaturesToTrack_test) ... /Users/opencv-cn/GHA-0CV-
2/_work/opencv/opencv/opencv/modules/ml/misc/python/test/test_goodfeatures.py:20: DeprecationWarning: tostring() is deprecated.
Use
tobytes() instead.
self.assertTrue(arr.tostring() == original.tostring())

Documentation: https://docs.python.org/3/library/array.html#array.array.tobytes

Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

• I agree to contribute to the project under Apache 2 License.
• To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
• The PR is proposed to the proper branch
• There is a reference to the original bug report and related work
• There is accuracy test, performance test and test data in opencv_extra repository, if applicable
  Patch to opencv_extra has the same branch name.
• The feature is well documented and sample code can be built with the project CMake