build(deps): bump library/golang from 1.26.7-alpine to 1.27.1-alpine

[dependabot]

Bumps library/golang from 1.26.7-alpine to 1.27.1-alpine.

[dependabot]

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Please fix the above issues or remove invalid values from dependabot.yml.

[duynhne]

Hold — not merged in the 2026-09-28 bot-PR sweep. golang 1.26.7 → 1.27.1 builds the production binary with Go 1.27 (new size-specialised allocator, asynctimerchan removed, new vet check in go test) while go.mod and CI still test with Go 1.26 — the shipped binary would be one no test ran. Bump the go directive / CI Go version and the builder image together, then run unit + testcontainers integration tests and the local-stack gate.

[duynhne]

Superseded by the G2 Go 1.27.1 PR for this repo, which moves the builder image, the go directive and CI together (homelab#1107 G2). Bumping the builder alone would ship a binary no test ran.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.