fix: typos in model picker (#6859)

# External (non-OpenAI) Pull Request Requirements

Before opening this Pull Request, please read the dedicated
"Contributing" markdown file or your PR may be closed:
https://github.com/openai/codex/blob/main/docs/contributing.md

If your PR conforms to our contribution guidelines, replace this text
with a detailed and high quality description of your changes.

Include a link to a bug report or enhancement request.

codex-rs/core/tests/suite/prompt_caching.rs

@@ -167,11 +167,12 @@ async fn prompt_tools_are_consistent_across_requests() -> anyhow::Result<()> {
                 "list_mcp_resource_templates",
                 "read_mcp_resource",
                 "update_plan",
+                "apply_patch",
                 "view_image",
             ],
         ),
         (
-            "gpt-5.1",
+            "arcticfox",
             vec![
                 "shell_command",
                 "list_mcp_resources",