Consistently create temp dirs under ledger/farf (#10848)

ledger-tool/src/main.rs

@@ -1341,7 +1341,7 @@ fn main() {
                     bank.clean_accounts();
                     bank.update_accounts_hash();
 
-                    let temp_dir = tempfile::TempDir::new().unwrap_or_else(|err| {
+                    let temp_dir = tempfile::tempdir_in(ledger_path).unwrap_or_else(|err| {
                         eprintln!("Unable to create temporary directory: {}", err);
                         exit(1);
                     });