breaking: change the default value of rcond from 1e-3 to None

[njzjz]

This is a breaking change. rcond=1e-3 is found inaccurate. Using NumPy's default value is more accurate and not too slow.

[codecov]

Codecov Report

Patch coverage: 80.00% and project coverage change: +0.01 🎉

Comparison is base (a2995b8) 78.36% compared to head (ab29eba) 78.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2688      +/-   ##
==========================================
+ Coverage   78.36%   78.37%   +0.01%     
==========================================
  Files         235      235              
  Lines       24506    24506              
  Branches     1469     1469              
==========================================
+ Hits        19204    19207       +3     
+ Misses       4910     4907       -3     
  Partials      392      392              

Impacted Files	Coverage Δ
deepmd/fit/dos.py	48.40% <ø> (ø)
deepmd/fit/ener.py	88.67% <ø> (ø)
deepmd/fit/polar.py	66.83% <0.00%> (ø)
deepmd/utils/argcheck.py	95.63% <100.00%> (ø)
deepmd/utils/data_system.py	84.00% <100.00%> (ø)
deepmd/utils/multi_init.py	79.51% <100.00%> (ø)

... and 2 files with indirect coverage changes

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