Update alpine Docker tag to v3.14.2

Author: renovate-bot

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:3.13.4@sha256:ec14c7992a97fc11425907e908340c6c3d6ff602f5f13d899e6b7027c9b4133a
+FROM alpine:3.14.2@sha256:e1c082e3d3c45cccac829840a25941e679c25d438cc8412c2fa221cf1a824e6a
 
 RUN apk add --update git unzip