chore(deps): update dependency ntfy to v2.21.0-0

requirements.yml

@@ -45,7 +45,7 @@
   version: v1.10.1-0
   name: livekit_server
 - src: git+https://github.com/mother-of-all-self-hosting/ansible-role-ntfy.git
-  version: v2.20.1-0
+  version: v2.21.0-0
   name: ntfy
 - src: git+https://github.com/devture/com.devture.ansible.role.playbook_help.git
   version: ea8c5cc750c4e23d004c9a836dfd9eda82d45ff4