CI: Drop nipy tests until a fixed nipy is released

[effigies]

Summary

nipy's bitrot is progressing.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +15.79 🎉

Comparison is base (cdfe679) 47.54% compared to head (bfa37d7) 63.34%.

❗ Current head bfa37d7 differs from pull request most recent head ec5b798. Consider uploading reports for the commit ec5b798 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3559       +/-   ##
===========================================
+ Coverage   47.54%   63.34%   +15.79%     
===========================================
  Files         309      309               
  Lines       40871    40900       +29     
  Branches     5381     5381               
===========================================
+ Hits        19432    25907     +6475     
+ Misses      21311    13985     -7326     
- Partials      128     1008      +880     

Impacted Files	Coverage Δ
nipype/interfaces/nipy/base.py	100.00% <100.00%> (+30.00%)	⬆️

... and 126 files with indirect coverage changes

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