Bump Go version to 1.20

[codebien]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2920 (1060e84) into master (8601303) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 1060e84 differs from pull request most recent head 6679289. Consider uploading reports for the commit 6679289 to get more accurate results

@@            Coverage Diff             @@
##           master    #2920      +/-   ##
==========================================
+ Coverage   76.92%   76.93%   +0.01%     
==========================================
  Files         225      225              
  Lines       16873    16873              
==========================================
+ Hits        12979    12981       +2     
  Misses       3062     3062              
+ Partials      832      830       -2     

Flag	Coverage Δ
ubuntu	76.83% <ø> (-0.02%)	⬇️
windows	76.74% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
metrics/value_type.go	62.50% <0.00%> (-6.25%)	⬇️
metrics/metric_type.go	78.94% <0.00%> (-3.51%)	⬇️
js/initcontext.go	88.18% <0.00%> (+1.57%)	⬆️
api/v1/metric.go	81.81% <0.00%> (+18.18%)	⬆️

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[olegbespalov]

Probably it makes sense to change the version in Dockerfile, but it could a separated PR

[mstoykov]

We should bump 1.18.x in the test.yml to 1.19.x as well

And Maybe even look into bumping golangci-lint as we are stuck at 1.18.x for it as well

[codebien]

And Maybe even look into bumping golangci-lint as we are stuck at 1.18.x for it as well

I'm already on it but I would prefer to open a dedicated PR