chore: bump golangci-lint to v2.12.2

[remyleone]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

❌ Patch coverage is 82.75862% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.35%. Comparing base (30e4055) to head (c88a8bf).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/args/args.go	60.00%	2 Missing ⚠️
core/human/marshal.go	80.00%	1 Missing ⚠️
core/reflect.go	50.00%	1 Missing ⚠️
internal/args/unmarshal.go	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5564   +/-   ##
=======================================
  Coverage   50.35%   50.35%           
=======================================
  Files         338      338           
  Lines       78574    78574           
=======================================
  Hits        39568    39568           
  Misses      37506    37506           
  Partials     1500     1500           

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[Copilot]

Pull request overview

This PR updates the repository’s linting setup to use golangci-lint v2.12.2 and applies code changes needed to satisfy newer lint/tooling expectations (notably around reflection pointer handling and reverse-iteration helpers).

Changes:

• Bump golangci-lint GitHub Action configuration to v2.12.2.
• Update reflection pointer-kind checks across the codebase (reflect.Ptr → reflect.Pointer).
• Replace manual reverse loops with slices.Backward(...) in argument/type traversal.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
internal/gofields/gofields.go	Updates pointer-kind handling in reflection helpers.
internal/args/unmarshal.go	Adds slices usage and updates pointer-kind checks during unmarshalling.
internal/args/marshal.go	Updates pointer-kind checks during marshalling.
internal/args/args.go	Uses slices.Backward and updates pointer-kind checks for arg type traversal.
core/reflect.go	Updates pointer-kind checks in reflection utilities.
core/human/utils.go	Updates nil-interface detection to use the new pointer kind constant.
core/human/marshal.go	Updates pointer-kind checks across human marshaling paths.
core/human/marshal_func.go	Updates marshalability checks for pointer types.
core/autocomplete_utils.go	Updates pointer-kind checks when traversing autocomplete resources.
.golangci.yml	Adjusts enabled linters for the new golangci-lint version (incl. gomodguard linter name change).
.github/workflows/lint.yml	Bumps the golangci-lint version used in CI.

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