Use Rust 1.58 format strings

src/main.rs

@@ -6,7 +6,7 @@ fn main() {
     let args = Args::from_args();
     match arch_rebuild_order::run(args.pkgnames, args.dbpath, args.repos, args.dotfile) {
         Ok(output) => {
-            println!("{}", output);
+            println!("{output}");
             std::process::exit(0);
         }
         Err(e) => {