Adjust io.load_nifti_get_mask to expect 4 dimensions in timeseries and 3 in masks by default

[smoia]

Closes #

Proposed Changes

Change Type

• bugfix (+0.0.1)
• minor (+0.1.0)
• major (+1.0.0)
• refactoring (no version update)
• test (no version update)
• infrastructure (no version update)
• documentation (no version update)
• other

Checklist before review

• I added everything I wanted to add to this PR.
• [Code or tests only] I wrote/updated the necessary docstrings.
• [Code or tests only] I ran and passed tests locally.
• [Documentation only] I built the docs locally.
• My contribution is harmonious with the rest of the code: I'm not introducing repetitions.
• My code respects the adopted style, especially linting conventions.
• The title of this PR is explanatory on its own, enough to be understood as part of a changelog.
• I added or indicated the right labels.

• I added information regarding the timeline of completion for this PR.

• Please, comment on my PR while it's a draft and give me feedback on the development!

[codecov]

Codecov Report

Merging #48 (8acd923) into master (6fd3cb1) will decrease coverage by 0.06%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   91.40%   91.33%   -0.07%     
==========================================
  Files          14       14              
  Lines        1210     1212       +2     
==========================================
+ Hits         1106     1107       +1     
- Misses        104      105       +1     

Impacted Files	Coverage Δ
nigsp/io.py	90.64% <50.00%> (-0.49%)	⬇️

[smoia]

🚀 PR was released in 0.15.0 🚀