Update cargo to 2024 edition (#842)

Some effects of this change:
- New formatting changes across many files. No functionality changes
should occur from that.
- Calls to `set_env` are considered unsafe, since this only happens in
tests we wrap them in `unsafe` blocks

codex-rs/tui/src/user_approval_widget.rs

@@ -26,8 +26,8 @@ use ratatui::widgets::List;
 use ratatui::widgets::Paragraph;
 use ratatui::widgets::Widget;
 use ratatui::widgets::WidgetRef;
-use tui_input::backend::crossterm::EventHandler;
 use tui_input::Input;
+use tui_input::backend::crossterm::EventHandler;
 
 use crate::app_event::AppEvent;
 use crate::exec_command::relativize_to_home;