refactor: update integral method

[12rambau]

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[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (aab45d0) 34.59% compared to head (3a56f16) 35.70%.
Report is 3 commits behind head on main.

❗ Current head 3a56f16 differs from pull request most recent head 282518b. Consider uploading reports for the commit 282518b to get more accurate results

Files	Patch %	Lines
geetools/tools/_deprecated_imagecollection.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
+ Coverage   34.59%   35.70%   +1.11%     
==========================================
  Files          53       53              
  Lines        2931     2907      -24     
  Branches      298      291       -7     
==========================================
+ Hits         1014     1038      +24     
+ Misses       1914     1866      -48     
  Partials        3        3              

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