fix dockerfile casing

Author: aptalca

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM ghcr.io/linuxserver/baseimage-alpine:3.22 as buildstage
+FROM ghcr.io/linuxserver/baseimage-alpine:3.22 AS buildstage
 
 # set version label
 ARG PYTHON_VERSION

Dockerfile.aarch64

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM ghcr.io/linuxserver/baseimage-alpine:arm64v8-3.22 as buildstage
+FROM ghcr.io/linuxserver/baseimage-alpine:arm64v8-3.22 AS buildstage
 
 # set version label
 ARG PYTHON_VERSION