Changed Sampling Method in gekpls.jl

[Spinachboul]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (aa744e5) 78.12% compared to head (2ff76f6) 78.12%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #454   +/-   ##
=======================================
  Coverage   78.12%   78.12%           
=======================================
  Files          23       23           
  Lines        3154     3154           
=======================================
  Hits         2464     2464           
  Misses        690      690           

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