fix: update brew auto update version check (#6238)

### Summary
* Use
`https://github.com/Homebrew/homebrew-cask/blob/main/Casks/c/codex.rb`
to get the latest available version for brew usage.

codex-rs/cli/src/main.rs

@@ -21,7 +21,7 @@ use codex_exec::Cli as ExecCli;
 use codex_responses_api_proxy::Args as ResponsesApiProxyArgs;
 use codex_tui::AppExitInfo;
 use codex_tui::Cli as TuiCli;
-use codex_tui::updates::UpdateAction;
+use codex_tui::update_action::UpdateAction;
 use owo_colors::OwoColorize;
 use std::path::PathBuf;
 use supports_color::Stream;