fix(package): update pg-promise to version 5.9.6

[flovilmart]

Closes #3943

[codecov]

Codecov Report

Merging #3949 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3949      +/-   ##
==========================================
+ Coverage   90.55%   90.58%   +0.02%     
==========================================
  Files         115      115              
  Lines        7783     7783              
==========================================
+ Hits         7048     7050       +2     
+ Misses        735      733       -2

Impacted Files	Coverage Δ
src/RestWrite.js	93.48% <0%> (+0.19%)	⬆️
src/Push/PushWorker.js	96.36% <0%> (+1.81%)	⬆️

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