ci: go back to golangci-lint 1.20.0

[sapk]

Revert #9711

I don't really know if it will fix thing but worth a try. 😄

[codecov-io]

Codecov Report

Merging #9742 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #9742      +/-   ##
==========================================
+ Coverage   42.26%   42.27%   +0.01%     
==========================================
  Files         597      597              
  Lines       78257    78257              
==========================================
+ Hits        33074    33086      +12     
+ Misses      41133    41118      -15     
- Partials     4050     4053       +3

Impacted Files	Coverage Δ
routers/repo/view.go	39.47% <0%> (+0.87%)	⬆️
models/webhook.go	70.46% <0%> (+1.06%)	⬆️
services/pull/check.go	55.4% <0%> (+2.02%)	⬆️
models/unit.go	67.56% <0%> (+5.4%)	⬆️

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[sapk]

I will retstart multiple time the job to find if it solved the problem.

[bagasme]

@sapk what's wrong so that you did this?

[sapk]

@bagasme golangci-lint fail "randomly" on various test. ex: https://drone.gitea.io/go-gitea/gitea/19284/1/10

[sapk]

So far 3 builds without problem

[6543]

working CI is more important than a new version :)

[sapk]

Yes, I am pretty sure that golangci-lint maintainer will figure it out.