Bump alpine from 3.21.2 to 3.21.3 in /cloud/docker-image/src/main/docker (#1404)

Bumps alpine from 3.21.2 to 3.21.3.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

cloud/docker-image/src/main/docker/alpine.Dockerfile

@@ -27,7 +27,7 @@ RUN apk add --no-cache wget
 RUN ./zpmw install --debug --exclude-remote-repositories
 RUN ./zpmw clean --keep-image
 
-FROM alpine:3.21.2
+FROM alpine:3.21.3
 
 ENV ZILLA_VERSION ${project.version}