Docker: switch to Alpine 3.20

Signed-off-by: Nicola Murino <[email protected]>

Dockerfile.alpine

@@ -1,4 +1,4 @@
-FROM golang:1.22-alpine3.19 AS builder
+FROM golang:1.22-alpine3.20 AS builder
 
 ENV GOFLAGS="-mod=readonly"
 
@@ -25,7 +25,7 @@ RUN set -xe && \
     export COMMIT_SHA=${COMMIT_SHA:-$(git describe --always --abbrev=8 --dirty)} && \
     go build $(if [ -n "${FEATURES}" ]; then echo "-tags ${FEATURES}"; fi) -trimpath -ldflags "-s -w -X github.com/drakkan/sftpgo/v2/internal/version.commit=${COMMIT_SHA} -X github.com/drakkan/sftpgo/v2/internal/version.date=`date -u +%FT%TZ`" -v -o sftpgo
 
-FROM alpine:3.19
+FROM alpine:3.20
 
 # Set to "true" to install jq and the optional git and rsync dependencies
 ARG INSTALL_OPTIONAL_PACKAGES=false