manager(deps): bump kyma-project/prod/external/library/alpine

Bumps kyma-project/prod/external/library/alpine from 3.21.2 to 3.21.3.

---
updated-dependencies:
- dependency-name: kyma-project/prod/external/library/alpine
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

components/serverless/deploy/manager/Dockerfile

@@ -20,11 +20,11 @@ RUN go build -ldflags "-s -w" -a -o manager ./components/serverless/cmd/manager/
     && mkdir /app \
     && mv ./manager /app/manager
 
-FROM europe-docker.pkg.dev/kyma-project/prod/external/library/alpine:3.21.2 as certs
+FROM europe-docker.pkg.dev/kyma-project/prod/external/library/alpine:3.21.3 as certs
 
 RUN apk add --no-cache ca-certificates
 
-FROM europe-docker.pkg.dev/kyma-project/prod/external/library/alpine:3.21.2
+FROM europe-docker.pkg.dev/kyma-project/prod/external/library/alpine:3.21.3
 
 ENV LIBGIT2_VERSION=1.5.2-r0