update scrfd_person.py - numpy int (deprecated)

[adityapp]

updating examples/person_detection/scrfd_person.py to use numpy int32

related issue: #2591

[Poehavshi]

There're also the same problem for other files in project

For example
alignment/coordinate_reg/image_infer.py:

        lmk = np.round(lmk).astype(np.int)

detection/scrfd/tools/scrfd.py

            x1,y1,x2,y2,score = bbox.astype(np.int)

                    kp = kp.astype(np.int)

So maybe numpy version must be pinned somehow or all places need to be fixed