fix: Default to grid-constant interpolation mode

[effigies]

This is a potential fix to #3475 and #3508. To test:

git clone https://github.com/nipreps/fmriprep.git fmriprep-3516
git -C fmriprep-3516 fetch origin refs/pull/3516/head
git -C fmriprep-3516 checkout FETCH_HEAD
fmriprep-docker [NORMAL ARGS] --patch fmriprep=$PWD/fmriprep-3516/fmriprep

@claraElk @HippocampusGirl Could you verify that this does not re-introduce the problems we were trying to fix in #3453?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.64%. Comparing base (cfe7a06) to head (bc5c33f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3516   +/-   ##
=======================================
  Coverage   73.64%   73.64%           
=======================================
  Files          60       60           
  Lines        4759     4759           
  Branches      616      616           
=======================================
  Hits         3505     3505           
  Misses       1111     1111           
  Partials      143      143           

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[HippocampusGirl]

Thanks for the heads-up! @claraElk and I are happy to have a look, but we likely need a week or two to re-run the analysis and get results

[effigies]

Sounds good. Will check in in two weeks.