bump to 13.9.4

[willmcgugan]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.25%. Comparing base (60f3b61) to head (e440ff2).
Report is 9 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3548      +/-   ##
==========================================
- Coverage   98.27%   98.25%   -0.02%     
==========================================
  Files          74       74              
  Lines        8096     8095       -1     
==========================================
- Hits         7956     7954       -2     
- Misses        140      141       +1     

Flag	Coverage Δ
unittests	98.25% <ø> (-0.02%)	⬇️

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