DeprecationWarning on SageMath 9.1 Console

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When I open SageMath Console, it will show such a paragraph:

/opt/sagemath-9.1/local/lib/python3.7/site-packages/psutil/_pscygwin.py:311:
DeprecationWarning: invalid escape sequence \d  
 search = re.compile('cpu\d')  

/opt/sagemath-9.1/local/lib/python3.7/site-packages/psutil/_pscygwin.py:876:
DeprecationWarning: invalid escape sequence \d  
 def uids(self, _uids_re=re.compile(b'Uid:\t(\d+)')):  

/opt/sagemath-9.1/local/lib/python3.7/site-packages/psutil/_pscygwin.py:887:
DeprecationWarning: invalid escape sequence \d  
 def gids(self, _gids_re=re.compile(b'Gid:\t(\d+)')):

The operating system I use is Windows 10 1909, the SageMath I use is version 9.1.

Is this a bug?