build(deps): bump the container-images group across 1 directory with 3 updates

[dependabot]

Bumps the container-images group with 3 updates in the /.buildkite directory: docker/library/golang, golangci/golangci-lint and ruby.

Updates docker/library/golang from 1.26.5 to 1.27.0

Updates golangci/golangci-lint from v2.12-alpine to v2.13-alpine

Updates ruby from c400c1e to 72e26fd

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[buildsworth-bk-app]

The upgraded lint image is not clean against the current tree; details are inline.

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[buildsworth-bk-app]

Blocking: golangci-lint v2.13 is not clean against the current tree. Running the upgraded binary reports SA1019 at internal/socket/server_test.go:113 because http.Transport.Dial is deprecated, while v2.12 reports no issue for that package. This Dockerfile is not in the lint step's if_changed paths, so this PR's CI won't expose the failure; the next lint-triggering change will. Please fix or suppress that finding as part of the upgrade, or keep this image on v2.12.