feat: sync Nextcloud capabilities: no public contract change

Reviewed upstream sharing app info.xml change (version bump 2.0.0-dev.1
to 2.0.0-dev.3 and registration of a new console command). Neither
change affects the public capabilities JSON response, so no Swift
model update is required. Advances tracked revision only.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 2 people

Automation/capability-sync-state.json

@@ -4,7 +4,7 @@
   "schemaVersion": 1,
   "upstreams": {
     "nextcloud/server": {
-      "revision": "31b2c78374d21090a15fe0460f9ce92470ba3bcf"
+      "revision": "556e9ec2a0eec853814cc7b1d7ffc1d72142a70c"
     }
   }
 }