Update golangci/golangci-lint Docker tag to v2.12.1

[renovate]

This PR contains the following updates:

Package	Update	Change
golangci/golangci-lint	patch	v2.12.0 → v2.12.1

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Release Notes

golangci/golangci-lint (golangci/golangci-lint)

v2.12.1

Compare Source

Released on 2026-05-01

1. Linters bug fixes
   • gomodguard_v2: fix panic with migration suggestion
2. Misc.
   • fix install.sh script (if you are still using an URL based on the branch master, please update to use https://golangci-lint.run/install.sh)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.47%. Comparing base (7cef7a8) to head (d264249).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6537      +/-   ##
==========================================
+ Coverage   41.45%   41.47%   +0.01%     
==========================================
  Files         431      431              
  Lines       28696    28696              
==========================================
+ Hits        11897    11902       +5     
+ Misses      15726    15724       -2     
+ Partials     1073     1070       -3     

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