Slightly increase timeout of test_spawner_unspawner

[christophfroehlich]

Closes #2036

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.32%. Comparing base (2dc3725) to head (360fbe1).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2037      +/-   ##
==========================================
- Coverage   89.33%   89.32%   -0.01%     
==========================================
  Files         138      138              
  Lines       14772    14774       +2     
  Branches     1270     1270              
==========================================
+ Hits        13196    13197       +1     
- Misses       1100     1102       +2     
+ Partials      476      475       -1     

Flag	Coverage Δ
unittests	89.32% <ø> (-0.01%)	⬇️

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see 5 files with indirect coverage changes