[to #42322933]update copyright header for body-2d-keypoints

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10311587

modelscope/models/cv/body_2d_keypoints/hrnet_v2.py

@@ -1,3 +1,5 @@
+# The implementation is based on HRNET, available at https://github.com/HRNet/HigherHRNet-Human-Pose-Estimation.
+
 import os
 
 import numpy as np

modelscope/models/cv/body_2d_keypoints/w48.py

@@ -1,3 +1,5 @@
+# The implementation is based on HRNET, available at https://github.com/HRNet/HigherHRNet-Human-Pose-Estimation.
+
 cfg_128x128_15 = {
     'DATASET': {
         'TYPE': 'DAMO',

modelscope/pipelines/cv/body_2d_keypoints_pipeline.py

@@ -1,3 +1,5 @@
+# Copyright (c) Alibaba, Inc. and its affiliates.
+
 import os.path as osp
 from typing import Any, Dict, List, Union