FIX failing load_confound test related to standardisation

[htwangtw]

• Closes Failures of some tests for load_confounds on mac OS 14 #4404

Changes proposed in this pull request:

• add trend to the simulated signal in load_confound test

Notes:

• the tests were only failing when detrend=True and the value is extremely close to zero in those instances hence we came up with this idea.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.03%. Comparing base (abb80ff) to head (82a684d).
Report is 69 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4411      +/-   ##
==========================================
+ Coverage   91.85%   92.03%   +0.17%     
==========================================
  Files         144      143       -1     
  Lines       16419    16639     +220     
  Branches     3434     3529      +95     
==========================================
+ Hits        15082    15313     +231     
+ Misses        792      758      -34     
- Partials      545      568      +23     

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[bthirion]

The change LGTM. Thx.

[man-shu]

LGTM too! Thanks!

[Remi-Gau]

Follow up PR: update CI to not test on macOS 13 and 14 separately