Bump alpine from 3.22.2 to 3.23.3 in /postorius

Bumps alpine from 3.22.2 to 3.23.3.

---
updated-dependencies:
- dependency-name: alpine
  dependency-version: 3.23.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

postorius/Dockerfile

@@ -1,5 +1,5 @@
 # syntax = docker/dockerfile:1.3
-FROM alpine:3.22.2
+FROM alpine:3.23.3
 
 # Install packages and dependencies for postorius and hyperkitty Add user for
 # executing apps, change ownership for uwsgi+django files and set execution

postorius/Dockerfile.dev

@@ -1,5 +1,5 @@
 # syntax = docker/dockerfile:1.3
-FROM alpine:3.22.2
+FROM alpine:3.23.3
 
 ARG POSTORIUS_REF
 ARG DJ_MM3_REF