Merge pull request #361 from Normo/bump-zammad-to-6.4.1

Install Zammad 6.4.1 by default

Author: tobiashuste

roles/zammad/README.md

@@ -31,7 +31,7 @@ The below requirements are needed on the target host:
 ## Role Variables
 
 ```yaml
-zammad_version: "6.3.1"
+zammad_version: "6.4.1"
 ```
 
 Zammad version to be installed.

roles/zammad/defaults/main.yml

@@ -4,7 +4,7 @@
 # SPDX-License-Identifier: MIT
 
 ---
-zammad_version: "6.3.1"
+zammad_version: "6.4.1"
 zammad_release_channel: "stable"
 zammad_domain_name: "{{ ansible_fqdn }}"