chore: update dependencies and fix lint

[ondbeh]

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[Copilot]

Pull request overview

This PR updates Go/module dependencies and the linting/tooling setup, with small test refactors to satisfy lint rules and a rework of the Semgrep GitHub Actions workflow to run Semgrep directly and upload SARIF.

Changes:

• Bump golangci-lint version and adjust golangci-lint configuration (including switching to gomodguard_v2).
• Update Go module dependencies (go.mod/go.sum) and refactor test literals into shared constants to address linting.
• Replace the Semgrep GitHub Action with a container-based semgrep scan invocation that outputs SARIF.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
Makefile	Updates golangci-lint version and installation method/URL used by make lint.
internal/resolver/resolver_test.go	Introduces a testID constant to remove repeated string literals in mocks.
internal/repository/server_test.go	Replaces hardcoded RRSet names with testURL constant.
internal/repository/rrset_repositry_test.go	Introduces testURL constant and replaces repeated RRSet name literals.
go.mod	Bumps Kubernetes and other indirect dependencies.
go.sum	Updates dependency checksums in line with go.mod updates.
.golangci.yaml	Updates Go version for linting and switches linter config to gomodguard_v2.
.github/workflows/semgrep.yaml	Runs Semgrep via container + CLI and uploads SARIF via upload-sarif.

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