Fix #33

[PFLeget]

This is the work around the issue describe in #33. The update to numpy 2.4 look to break iminuit but I found the work around (1 line of code). I was giving an array as an input but looks to be better with just a float.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.42%. Comparing base (d07af6a) to head (107201d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #34   +/-   ##
=======================================
  Coverage   87.42%   87.42%           
=======================================
  Files           8        8           
  Lines         803      803           
=======================================
  Hits          702      702           
  Misses        101      101           

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