increase tutorial test timeout

[janfb]

During the release, the GitHub action that executes and then strips all notebooks before building the docs failed because the decision making example notebook took longer than 10min to execute. Here, we increase to timeout to avoid this failure in the future.

[manuelgloeckler]

Looks good.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.42%. Comparing base (d3f22b5) to head (0c6e8e2).
Report is 9 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1360       +/-   ##
===========================================
- Coverage   89.40%   78.42%   -10.99%     
===========================================
  Files         118      118               
  Lines        8715     8749       +34     
===========================================
- Hits         7792     6861      -931     
- Misses        923     1888      +965     

Flag	Coverage Δ
unittests	78.42% <ø> (-10.99%)	⬇️

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see 33 files with indirect coverage changes