[chore] Update a builder test to use go1.20

[dmitryax]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (c46704a) 90.27% compared to head (bced2a9) 90.27%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8222   +/-   ##
=======================================
  Coverage   90.27%   90.27%           
=======================================
  Files         301      301           
  Lines       15581    15581           
=======================================
  Hits        14065    14065           
  Misses       1227     1227           
  Partials      289      289           

Files Changed	Coverage Δ
cmd/builder/internal/builder/main.go	60.82% <100.00%> (ø)

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