ruff: Fix PERF401 Use a list comprehension to create a transformed list.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/openapi/python_examples.py

@@ -1162,9 +1162,7 @@ def update_message_flags(client: Client) -> None:
         "topic": "Castle",
         "content": "I come not, friends, to steal away your hearts.",
     }
-    message_ids = []
-    for i in range(0, 3):
-        message_ids.append(client.send_message(request)["id"])
+    message_ids = [client.send_message(request)["id"] for i in range(3)]
 
     # {code_example|start}
     # Add the "read" flag to the messages with IDs in "message_ids"