MAINT fix compatibility with scikit-learn 1.7

[glemaitre]

closes #1131

Fixing a couple of small issue mainly.
It should also fix the issue observed in #1131

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.88%. Comparing base (e32819e) to head (c8a1ed8).
Report is 36 commits behind head on master.

Files with missing lines	Patch %	Lines
imblearn/ensemble/_easy_ensemble.py	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1137      +/-   ##
==========================================
+ Coverage   92.98%   93.88%   +0.89%     
==========================================
  Files         105       54      -51     
  Lines        8323     3612    -4711     
  Branches     1288      487     -801     
==========================================
- Hits         7739     3391    -4348     
+ Misses        465      123     -342     
+ Partials      119       98      -21     

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