Bump alpine from 3.20 to 3.21 in /deploy/docker/data in the docker group

Bumps the docker group in /deploy/docker/data with 1 update: alpine.


Updates `alpine` from 3.20 to 3.21

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: docker
...

Signed-off-by: dependabot[bot] <[email protected]>

deploy/docker/data/Dockerfile

@@ -7,7 +7,7 @@ FROM ${PLANATILER_IMAGE} AS planetiler
 FROM ghcr.io/cmahnke/map-tools/osmium:latest AS osmium
 FROM ghcr.io/cmahnke/map-tools/osmctools:latest AS osmctools
 
-FROM alpine:3.20 as builder
+FROM alpine:3.21 as builder
 
 ARG COVERAGE=central-europe.json
 #tile_compression=gzip (the tile compression, one of [none, gzip])
@@ -92,7 +92,7 @@ RUN --mount=target=/mnt/build-context \
 
 # Restart from an empty image to get rid of layers
 #FROM scratch
-FROM alpine:3.20
+FROM alpine:3.21
 
 ENV DATA_DIR=/data