[MAINT] DeprecationWarning: use HasTraits.trait_set instead

[oesteban]

Fix this warning that is populating nipype logs lately.

[codecov-io]

Codecov Report

Merging #2792 into master will decrease coverage by 3.4%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2792      +/-   ##
==========================================
- Coverage   67.51%   64.11%   -3.41%     
==========================================
  Files         341      339       -2     
  Lines       43287    43239      -48     
  Branches     5364     5364              
==========================================
- Hits        29225    27721    -1504     
- Misses      13361    14448    +1087     
- Partials      701     1070     +369

Flag	Coverage Δ
#smoketests	?
#unittests	64.11% <100%> (-0.82%)	⬇️

Impacted Files	Coverage Δ
nipype/pipeline/engine/utils.py	71.54% <100%> (-10.55%)	⬇️
nipype/interfaces/nilearn.py	40% <0%> (-56.67%)	⬇️
nipype/utils/spm_docs.py	25.92% <0%> (-44.45%)	⬇️
nipype/interfaces/freesurfer/base.py	49.59% <0%> (-30.9%)	⬇️
nipype/utils/logger.py	59.7% <0%> (-29.86%)	⬇️
nipype/algorithms/rapidart.py	35.39% <0%> (-29.21%)	⬇️
nipype/interfaces/spm/base.py	58.41% <0%> (-29.05%)	⬇️
nipype/utils/provenance.py	55.73% <0%> (-28.99%)	⬇️
nipype/interfaces/fsl/model.py	55.26% <0%> (-25.35%)	⬇️
nipype/testing/fixtures.py	77.33% <0%> (-21.34%)	⬇️
... and 42 more

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