Merge branch 'renovate/docker-nextcloud-21.x' into 'deployment'

automation: Update nextcloud Docker tag to v21

See merge request !64

roles/nextcloud/defaults/main.yml

@@ -29,7 +29,7 @@ nextcloud_domain: cloud.example.com
 nextcloud_admin_user: admin
 nextcloud_admin_password: "{{ lookup('passwordstore',  nextcloud_domain +  '/' + nextcloud_admin_user + ' create=true') }}"
 # renovate: depName=docker.io/library/nextcloud
-nextcloud_version: 20.0
+nextcloud_version: 21.0
 
 # renovate: depName=docker.io/library/memcached
 nextcloud_memcache_version: 1.6.9