chore(deps): update alpine docker tag to v3.21.0

Author: renovate[bot]

Caddy.Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 RUN apk add --no-cache ca-certificates tzdata
 COPY --from=caddy:2.8.4 /usr/bin/caddy /usr/bin/caddy
 COPY Caddyfile /etc/caddy/Caddyfile

Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:labs
-FROM --platform="$BUILDPLATFORM" alpine:3.20.3 AS frontend
+FROM --platform="$BUILDPLATFORM" alpine:3.21.0 AS frontend
 COPY frontend                        /app
 COPY global/certbot-dns-plugins.json /app/certbot-dns-plugins.json
 ARG NODE_ENV=production \
@@ -18,7 +18,7 @@ COPY darkmode.css /app/dist/css/darkmode.css
 COPY security.txt /app/dist/.well-known/security.txt
 
 
-FROM --platform="$BUILDPLATFORM" alpine:3.20.3 AS build-backend
+FROM --platform="$BUILDPLATFORM" alpine:3.21.0 AS build-backend
 SHELL ["/bin/ash", "-eo", "pipefail", "-c"]
 COPY backend                         /app
 COPY global/certbot-dns-plugins.json /app/certbot-dns-plugins.json
@@ -37,15 +37,15 @@ RUN apk upgrade --no-cache -a && \
     fi && \
     yarn cache clean --all && \
     clean-modules --yes
-FROM alpine:3.20.3 AS strip-backend
+FROM alpine:3.21.0 AS strip-backend
 COPY --from=build-backend /app /app
 RUN apk upgrade --no-cache -a && \
     apk add --no-cache ca-certificates binutils file && \
     find /app/node_modules -name "*.node" -type f -exec strip -s {} \; && \
     find /app/node_modules -name "*.node" -type f -exec file {} \;
 
 
-FROM --platform="$BUILDPLATFORM" alpine:3.20.3 AS crowdsec
+FROM --platform="$BUILDPLATFORM" alpine:3.21.0 AS crowdsec
 SHELL ["/bin/ash", "-eo", "pipefail", "-c"]
 ARG CSNB_VER=v1.0.8
 WORKDIR /src