Admin: Increase SFN test duration

[bblommers]

The tests against AWS tend to fail for two reason:

• The SFN executions take too long, causing the test to timeout
• The overall tests take too long, causing the IAM credentials to timeout

This should fix both.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.60%. Comparing base (1e4364d) to head (3adf58e).
Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8437   +/-   ##
=======================================
  Coverage   94.60%   94.60%           
=======================================
  Files        1167     1168    +1     
  Lines      101685   101707   +22     
=======================================
+ Hits        96198    96223   +25     
+ Misses       5487     5484    -3     

Flag	Coverage Δ
servertests	28.82% <ø> (-0.01%)	⬇️
unittests	94.58% <ø> (+<0.01%)	⬆️

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