Bump go version to 1.20

[yosifkit]

Just a regular go version bump to keep us on a supported version.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.10%. Comparing base (9b8e397) to head (9128f86).
Report is 73 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #76   +/-   ##
=======================================
  Coverage   73.10%   73.10%           
=======================================
  Files           7        7           
  Lines         714      714           
=======================================
  Hits          522      522           
  Misses        162      162           
  Partials       30       30           

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