Update etherpad 1.8.18 -> 1.9.0

requirements.yml

@@ -30,7 +30,7 @@
 - src: git+https://github.com/devture/com.devture.ansible.role.traefik_certs_dumper.git
   version: v2.8.1-0
 - src: git+https://gitlab.com/etke.cc/roles/etherpad.git
-  version: v1.8.18-2
+  version: v1.9.0-0
 - src: git+https://github.com/geerlingguy/ansible-role-docker
   version: 6.1.0
   name: geerlingguy.docker