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

Most Recent Ignore Conditions Applied to This Pull Request

Dependency Name	Ignore Conditions
docker/library/golang	[>= 1.26.a, < 1.27]

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[buildsworth-bk-app]

The Go compiler bump introduces a customer-facing compatibility break in the published macOS artifacts; I left one blocking comment on that path.

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[buildsworth-bk-app]

Blocking: This image is also the compiler for the published release matrix (via the agent compose service and scripts/build-binary.sh), including the Darwin artifacts. Go 1.27 raises the minimum supported macOS version to 13, while Go 1.26 is the last release supporting macOS 12, so merging this as-is would make the next agent release unusable on Monterey. Please keep the compile image on Go 1.26 until that compatibility change is handled explicitly; the lint and Ruby image updates can still land.