Update alpine Docker tag to v3.21.3

renovate[bot] · web-flow · commit 768401f91ef7 · 2025-03-12T14:44:32.000Z
diff --git a/docker/batch-change-volume-workspace/Dockerfile b/docker/batch-change-volume-workspace/Dockerfile
@@ -2,6 +2,6 @@
 # image that we use to run curl, git, and unzip against a Docker volume when
 # using the volume workspace.
 
-FROM alpine:3.19.1@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b
+FROM alpine:3.21.3@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c
 
 RUN apk add --update git unzip
