[MAINT] Deal with Numpy alltrue deprecation

[ymzayek]

• Relates to [MAINT] Implement deprecation warnings-as-errors in prerelease test using pytest fixture #3936

[github-actions]

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[codecov]

Codecov Report

Merging #3996 (47c42c0) into main (70da7b7) will increase coverage by 0.06%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3996      +/-   ##
==========================================
+ Coverage   91.70%   91.77%   +0.06%     
==========================================
  Files         134      134              
  Lines       15786    15786              
  Branches     3291     3291              
==========================================
+ Hits        14476    14487      +11     
+ Misses        767      755      -12     
- Partials      543      544       +1     

Flag	Coverage Δ
macos-latest_3.10	91.68% <100.00%> (ø)
macos-latest_3.11	91.68% <100.00%> (ø)
macos-latest_3.8	91.64% <100.00%> (ø)
macos-latest_3.9	91.65% <100.00%> (ø)
ubuntu-latest_3.10	91.68% <100.00%> (ø)
ubuntu-latest_3.11	91.68% <100.00%> (ø)
ubuntu-latest_3.8	91.64% <100.00%> (?)
ubuntu-latest_3.9	91.65% <100.00%> (?)
windows-latest_3.10	91.63% <100.00%> (ø)
windows-latest_3.11	91.63% <100.00%> (ø)
windows-latest_3.8	91.59% <100.00%> (ø)
windows-latest_3.9	91.59% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
nilearn/plotting/find_cuts.py	88.83% <100.00%> (ø)

... and 5 files with indirect coverage changes

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[bthirion]

LGTM

[Remi-Gau]

Same. LGTM too.