Update catalog information

catalog.json

@@ -262,9 +262,9 @@
             "location": "/__w/charts/charts/charts/nextcloud",
             "healthy": true,
             "healthy_error": null,
-            "latest_version": "1.6.14",
-            "latest_app_version": "25.0.1",
-            "latest_human_version": "25.0.1_1.6.14",
+            "latest_version": "1.6.15",
+            "latest_app_version": "25.0.2",
+            "latest_human_version": "25.0.2_1.6.15",
             "icon_url": "https://cdn.rawgit.com/docker-library/docs/defa5ffc7123177acd60ddef6e16bddf694cc35f/nextcloud/logo.svg"
         }
     },
@@ -531,9 +531,9 @@
             "location": "/__w/charts/charts/test/nextcloud",
             "healthy": true,
             "healthy_error": null,
-            "latest_version": "1.6.14",
-            "latest_app_version": "25.0.1",
-            "latest_human_version": "25.0.1_1.6.14",
+            "latest_version": "1.6.15",
+            "latest_app_version": "25.0.2",
+            "latest_human_version": "25.0.2_1.6.15",
             "icon_url": "https://cdn.rawgit.com/docker-library/docs/defa5ffc7123177acd60ddef6e16bddf694cc35f/nextcloud/logo.svg"
         }
     },