lint: bump golangci-lint to v1.63

[tri-adam]

Enable exptostd, nilnesserr and usetesting linters.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.48%. Comparing base (6d066aa) to head (347d076).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #401   +/-   ##
=======================================
  Coverage   65.48%   65.48%           
=======================================
  Files          37       37           
  Lines        3265     3265           
=======================================
  Hits         2138     2138           
  Misses        973      973           
  Partials      154      154           

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