FIX: Use standard library pathlib

[shnizzedy]

With

nitransforms/setup.cfg

Line 24 in f69faaf

python_requires = >= 3.8

and pathlib incorporated into the standard Python library in v3.4, we should rely on the pathlib in the standard Python library, not the unmaintained pathlib on PyPI intended for Python < 3.4.

Related: #203 (comment), #203 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.76%. Comparing base (cd10b71) to head (b2a404f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #222   +/-   ##
=======================================
  Coverage   94.76%   94.76%           
=======================================
  Files          15       15           
  Lines        1756     1756           
  Branches      328      328           
=======================================
  Hits         1664     1664           
  Misses         76       76           
  Partials       16       16           

Flag	Coverage Δ
unittests	94.76% <ø> (ø)

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