build: bump library/alpine from 3.23.0 to 3.23.3

Bumps library/alpine from 3.23.0 to 3.23.3.

---
updated-dependencies:
- dependency-name: library/alpine
  dependency-version: 3.23.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 FROM docker.io/nginxproxy/docker-gen:0.16.1 AS docker-gen
 
-FROM docker.io/library/alpine:3.23.0
+FROM docker.io/library/alpine:3.23.3
 
 ARG GIT_DESCRIBE="unknown"
 ARG ACMESH_VERSION=3.1.2