Remove forked golangci-lint

[AlekSi]

Readiness checklist

• I added tests for new functionality or bugfixes.
• I ran task all, and it passed.
• I added/updated comments for both exported and unexported top-level declarations (functions, types, etc).
• I checked comments rendering with task godocs.
• I ensured that the title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Assignee, Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[vercel]

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Name	Status	Preview	Updated
ferret-db	✅ Ready (Inspect)	Visit Preview	Oct 13, 2022 at 0:03AM (UTC)

[codecov]

Codecov Report

Merging #1258 (068e0e7) into main (7ffcfa6) will decrease coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1258      +/-   ##
==========================================
- Coverage   66.33%   66.31%   -0.03%     
==========================================
  Files         269      269              
  Lines       12903    12903              
==========================================
- Hits         8559     8556       -3     
- Misses       3399     3401       +2     
- Partials      945      946       +1     

Impacted Files	Coverage Δ
internal/util/version/version.go	48.52% <0.00%> (-4.42%)	⬇️
internal/handlers/common/filter.go	86.58% <0.00%> (ø)

Flag	Coverage Δ
integration	61.02% <ø> (-0.03%)	⬇️
mongodb	13.76% <ø> (-0.07%)	⬇️
pg	50.79% <ø> (-0.03%)	⬇️
tigris	32.91% <ø> (-0.03%)	⬇️
unit	25.84% <ø> (-0.03%)	⬇️

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

[rumyantseva]

LGTM