Bump goreleaser/goreleaser-pro in /.buildkite (#403)

Bumps goreleaser/goreleaser-pro from v2.4.7-pro to v2.4.8-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>
Co-authored-by: Lizette Rabuya <115472349+lizrabuya@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:v2.4.7-pro@sha256:d9b5bf3146c797d559ac8794e4fdc195166940995ec02b1284e0c12e594af4a3
+FROM goreleaser/goreleaser-pro:v2.4.8-pro@sha256:7f96ff985d58185fa4a73443b218b02bc64d3515771acbab73cdb5aac2d55821