chore: bump golangci-lint to v1.57

[tri-adam]

Bump golangci-lint to v1.57. Add copyloopvar and intrange, which won't come into play until this module adopts Go 1.22 but play nicely with Go 1.21. Drop loop variable usage in (non-parallel) tests, which is safe for Go 1.21 and will lessen the number of changes required for a clean copyloopvar run when Go 1.22 is adopted.

Add patch version to go directive in go.mod (see golang/go#62278).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.26%. Comparing base (796011b) to head (60d5791).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #357   +/-   ##
=======================================
  Coverage   65.26%   65.26%           
=======================================
  Files          34       34           
  Lines        3245     3245           
=======================================
  Hits         2118     2118           
  Misses        974      974           
  Partials      153      153           

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