Bump golang from 1.20.5-bullseye to 1.21.3-bullseye in /cicd (#259)

Bumps golang from 1.20.5-bullseye to 1.21.3-bullseye.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

cicd/Dockerfile_goreleaser

@@ -1,5 +1,5 @@
 #syntax=docker/dockerfile-upstream:1.5
-FROM --platform=$BUILDPLATFORM golang:1.20.5-bullseye as build
+FROM --platform=$BUILDPLATFORM golang:1.21.3-bullseye as build
 
 RUN <<EOT
     set -e