Merge #3363

3363: Update 3rd party deps (backport #3358) r=mergify[bot] a=mergify[bot]

## What type of PR?

bug-fix

## What does this PR do?

Update 3rd party deps (clamav & snappymail), clarify the wording in the docs related to rspamd overrides.

### Related issue(s)
- closes #3347 
- closes #3360 (thank you [ctrl-i](https://github.com/ctrl-i) for the heads up)
- #3359 

## 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.
<hr>This is an automatic backport of pull request #3358 done by [Mergify](https://mergify.com).

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

core/admin/mailu/models.py

@@ -276,7 +276,7 @@ class Domain(Base):
             f'_{proto}._tcp.{self.name}. 600 IN SRV {prio} 1 {port} {hostname}.' if port in ports else f'_{proto}._tcp.{self.name}. 600 IN SRV 0 0 0 .'
             for proto, port, prio
             in protocols
-        ]+[f'autoconfig.{self.name}. 600 IN CNAME {hostname}.']
+        ]+[f'autoconfig.{self.name}. 600 IN CNAME {hostname}.', f'autodiscover.{self.name}. 600 IN CNAME {hostname}.']
 
     @cached_property
     def dns_tlsa(self):