chore: update app-repo.json

Author: github-actions[bot]

app-repo.json

@@ -13,6 +13,13 @@
       "tintColor": "aa454d",
       "category": "social",
       "versions": [
+        {
+          "version": "291.0",
+          "date": "2025-08-24",
+          "size": 93959832,
+          "downloadURL": "https://github.com/unbound-app/loader-ios/releases/download/v291.0/Unbound.ipa",
+          "localizedDescription": "Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience."
+        },
         {
           "version": "288.0",
           "date": "2025-07-15",