add async/await for postgres

[chrisllontop]

Please check if the PR fulfills these requirements

• Followed the Contributing guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.08 🎉

Comparison is base (17855a1) 99.91% compared to head (1d20967) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #748      +/-   ##
===========================================
+ Coverage   99.91%   100.00%   +0.08%     
===========================================
  Files          21        21              
  Lines        2423      2405      -18     
  Branches      122       122              
===========================================
- Hits         2421      2405      -16     
+ Misses          2         0       -2     

Impacted Files	Coverage Δ
packages/postgres/src/index.js	100.00% <100.00%> (+1.35%)	⬆️

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