Merge #2637

2637: Upgrade to alpine 3.17.1 r=mergify[bot] a=nextgens

New openssl, new dovecot

## What type of PR?

enhancement

## What does this PR do?

Upgrade to alpine 3.17.1; new openssl + new dovecot

### Related issue(s)

## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [ ] In case of feature or enhancement: documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.


Co-authored-by: Florent Daigniere <nextgens@freenetproject.org>

core/base/Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile-upstream:1.4.3
 
 # base system image (intermediate)
-ARG DISTRO=alpine:3.17.0
+ARG DISTRO=alpine:3.17.1
 FROM $DISTRO as system
 
 ENV TZ=Etc/UTC LANG=C.UTF-8

towncrier/newsfragments/2636.enhancement

@@ -0,0 +1 @@
+Upgrade to alpine 3.17.1