chore(deps): update alpine docker tag to v3.21.2

Author: renovate[bot]

Earthfile

@@ -13,7 +13,7 @@ COPY_METADATA:
 
 
 alpine-base:
-    FROM alpine:3.20.3@sha256:1e42bbe2508154c9126d48c2b8a75420c3544343bf86fd041fb7527e017a4b4a
+    FROM alpine:3.21.2@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099
     # renovate: datasource=repology depName=alpine_3_20/bash versioning=loose
     ENV BASH_VERSION="5.2.26-r0"
     RUN apk add --no-cache bash=$BASH_VERSION