[MAINT] drop python 3.7

[Remi-Gau]

• Relates to Roadmap 0.11.0 #3812

Changes proposed in this pull request:

• drop python 3.7 and update CI and tests accordingly

[github-actions]

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[codecov]

Codecov Report

Merging #4033 (e9fabe4) into main (0260648) will decrease coverage by 0.02%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4033      +/-   ##
==========================================
- Coverage   91.60%   91.59%   -0.02%     
==========================================
  Files         143      143              
  Lines       16096    16086      -10     
  Branches     3347     3346       -1     
==========================================
- Hits        14745    14734      -11     
  Misses        804      804              
- Partials      547      548       +1     

Flag	Coverage Δ
macos-latest_3.10	91.50% <ø> (+<0.01%)	⬆️
macos-latest_3.11	91.50% <ø> (+<0.01%)	⬆️
macos-latest_3.12	91.50% <ø> (+<0.01%)	⬆️
macos-latest_3.8	?
macos-latest_3.9	91.47% <ø> (+<0.01%)	⬆️
ubuntu-latest_3.10	91.50% <ø> (+<0.01%)	⬆️
ubuntu-latest_3.11	91.50% <ø> (+<0.01%)	⬆️
ubuntu-latest_3.12	91.50% <ø> (+<0.01%)	⬆️
ubuntu-latest_3.8	?
ubuntu-latest_3.9	91.47% <ø> (+<0.01%)	⬆️
windows-latest_3.10	91.45% <ø> (+<0.01%)	⬆️
windows-latest_3.11	91.45% <ø> (+<0.01%)	⬆️
windows-latest_3.12	91.45% <ø> (+<0.01%)	⬆️
windows-latest_3.9	91.41% <ø> (+<0.01%)	⬆️

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

Files	Coverage Δ
nilearn/__init__.py	55.55% <ø> (-23.40%)	⬇️

... and 1 file with indirect coverage changes

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[bthirion]

I'm not sure we should already deprecate Python 3.8 ?

[ymzayek]

I'm not sure either. 3.8 reaches EOL in October next year. We can discuss in the coredev meeting

[bthirion]

LGTM, thx.

[ymzayek]

Thanks!