Bump goreleaser/goreleaser-pro in /.buildkite (#392)

Bumps goreleaser/goreleaser-pro from v2.3.2-pro to v2.4.2-pro.

---
updated-dependencies:
- dependency-name: goreleaser/goreleaser-pro
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.buildkite/Dockerfile

@@ -1,4 +1,4 @@
 # This uses the upstream image without any changes intentionally.
 # This allows dependabot to keep this version up-to-date for us automatically, since it does not work with
 # docker-compose directly
-FROM goreleaser/goreleaser-pro:v2.3.2-pro@sha256:7f1a1b8a5452ee4d8532de467da6804441d630bae37553322e0271bcbcfded01
+FROM goreleaser/goreleaser-pro:v2.4.2-pro@sha256:257ea1b3a05912e49674c21155c5260bd69a445a2dd3140b8adcf49d9e0ee793