chore(go): go-openapi requires go.1.20 across the board

[fredbi]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.89%. Comparing base (1cc63fa) to head (a034025).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #313      +/-   ##
==========================================
+ Coverage   81.88%   81.89%   +0.01%     
==========================================
  Files          49       49              
  Lines        3351     3353       +2     
==========================================
+ Hits         2744     2746       +2     
  Misses        495      495              
  Partials      112      112              

Flag	Coverage Δ
1.19	?
1.20	81.89% <100.00%> (?)
oldstable	81.89% <100.00%> (+0.01%)	⬆️
stable	81.89% <100.00%> (+0.01%)	⬆️

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[fredbi]

@youyuanwu as per previous discussion: all go-openapi repos are now updated to go1.20.