Bump the minimum supported Go version to 1.20

[tagatac]

What is changing:

• Bump the Go version to 1.20
• Use that specific version in the GH action tests

Why this change is being made: jessevdk/go-flags requires Go 1.20: https://github.com/jessevdk/go-flags/blob/c02e333e441eb1187c25e6d689d769d499ec2a0b/go.mod#L3

Related issue(s): None

Follow-up changes needed: None

Is the change completely covered by unit tests? If not, why not?: N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.28%. Comparing base (2ec2203) to head (7aa570e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #65   +/-   ##
=======================================
  Coverage   93.28%   93.28%           
=======================================
  Files          14       14           
  Lines         789      789           
=======================================
  Hits          736      736           
  Misses         49       49           
  Partials        4        4           

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