Bump the docker-images group in /build with 1 update

Bumps the docker-images group in /build with 1 update: alpine.


---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: docker-images
...

Signed-off-by: dependabot[bot] <support@github.com>

build/Dockerfile

@@ -75,7 +75,7 @@ RUN --mount=from=busybox:musl,src=/bin/,dst=/bin/ printf "%s\n" "Acquire::https:
 
 
 ############################################# Base image for Alpine with NGINX Plus #############################################
-FROM alpine:3.18 as alpine-plus
+FROM alpine:3.19 as alpine-plus
 ARG NGINX_PLUS_VERSION
 
 RUN --mount=type=secret,id=nginx-repo.crt,dst=/etc/apk/cert.pem,mode=0644 \