update alpine, fix artifact check url

Author: aptalca

Dockerfile

@@ -1,12 +1,12 @@
 # syntax=docker/dockerfile:1
 
-FROM ghcr.io/linuxserver/baseimage-alpine:3.19 as buildstage
+FROM ghcr.io/linuxserver/baseimage-alpine:3.23 AS buildstage
 
 ARG MOD_VERSION
 
 RUN \
   if [ -z "${MOD_VERSION}" ]; then \
-    MOD_VERSION=$(curl -sL https://julialang.org/downloads/ \
+    MOD_VERSION=$(curl -sL https://julialang.org/downloads/manual-downloads/ \
       | grep 'Current stable release:' \
       | sed 's|.*Current stable release: v||' \
       | sed 's| (.*||'); \