Bump alpine from 3.21.2 to 3.21.3 (#2915)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mats Bolstad <[email protected]>

Author: dependabot[bot]

Dockerfile

@@ -10,7 +10,7 @@ RUN jdeps --print-module-deps --multi-release 21 -q --ignore-missing-deps  --add
 RUN jlink --add-modules $(cat modules.deps) --strip-debug --no-man-pages --no-header-files --compress=1 --output javaruntime
 
 
-FROM alpine:3.21.2
+FROM alpine:3.21.3
 RUN apk update && \
     apk upgrade && \
     apk add dumb-init