chore: bump golangci-lint to v2.12

[tri-adam]

Replace deprecated gomodguard linter.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.61%. Comparing base (db97057) to head (a452fc0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #458   +/-   ##
=======================================
  Coverage   65.61%   65.61%           
=======================================
  Files          37       37           
  Lines        3257     3257           
=======================================
  Hits         2137     2137           
  Misses        969      969           
  Partials      151      151           

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