Fix lint warnings about missing galaxy_info in meta

Not sure why this is needed but whatever. 

https://github.com/ansible/schemas/discussions/227

roles/archwiki/meta/main.yml

+galaxy_info:
+  description: archwiki role
+  standalone: false
+
 dependencies:
   - role: nginx

roles/geo_dns/meta/main.yml

+galaxy_info:
+  description: geo_dns role
+  standalone: false
+
 dependencies:
   - role: geoipupdate
     vars:

roles/postfix_null/meta/main.yml

+galaxy_info:
+  description: postfix_null role
+  standalone: false
+
 dependencies:
   - role: postfwd
     delegate_to: mail.archlinux.org

roles/rspamd/meta/main.yml

+galaxy_info:
+  description: rspamd role
+  standalone: false
+
 dependencies:
   - role: redis