Fix runnotebooks.sh by sorting the notebooks

[hugobuddel]

untested

[hugobuddel]

This should fix the failing ScopeSim_Data runs, e.g. https://github.com/AstarVienna/ScopeSim_Data/actions/runs/13004085952/job/36267864985 fails because it starts with 3_custom_effects.ipynb.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.00%. Comparing base (7e72629) to head (cd33aaf).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #535   +/-   ##
=======================================
  Coverage   77.00%   77.00%           
=======================================
  Files          66       66           
  Lines        8216     8216           
=======================================
  Hits         6327     6327           
  Misses       1889     1889           

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[teutoburg]

Shouldn't have any negative consequences to sort them I guess...