fix: increase timeout for flaky nonzero PTY exit test

Author: branchseer

crates/pty_terminal/tests/terminal.rs

@@ -352,7 +352,7 @@ fn read_to_end_returns_exit_status_success() {
 }
 
 #[test]
-#[timeout(5000)]
+#[timeout(15000)]
 fn read_to_end_returns_exit_status_nonzero() {
     let cmd = CommandBuilder::from(command_for_fn!((), |(): ()| {
         std::process::exit(42);