Use cumulative_trapezoid instead of cumtrapz

[ericpre]

In #33, I missed one deprecation (see https://github.com/hyperspy/hyperspy-extensions-list/actions/runs/8612136996/job/23600692746).

I couldn't find it in the scipy release notes but the relevant issue/PR are scipy/scipy#18702 and scipy/scipy#18699.

Progress of the PR

• Use cumulative_trapezoid instead of cumtrapz,
• [n/a] docstring updated (if appropriate),
• [n/a] update user guide (if appropriate),
• [n/a] added tests,
• [n/a] add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• [n/a] Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:exspy build of this PR (link in github checks)
• ready for review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.47%. Comparing base (6412ba7) to head (77b0dfa).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage   88.47%   88.47%           
=======================================
  Files          67       67           
  Lines        7287     7287           
  Branches     1179     1179           
=======================================
  Hits         6447     6447           
  Misses        571      571           
  Partials      269      269           

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