Update to Go 1.20 and fix unit tests

[ccojocar]

• Fix unit tests for Go 1.20
• Update to Go 1.20 in the build scripts

[codecov-commenter]

Codecov Report

Base: 74.83% // Head: 74.83% // No change to project coverage 👍

Coverage data is based on head (3037891) compared to base (b4270dd).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #923   +/-   ##
=======================================
  Coverage   74.83%   74.83%           
=======================================
  Files          51       51           
  Lines        3251     3251           
=======================================
  Hits         2433     2433           
  Misses        748      748           
  Partials       70       70           

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