fix: format("{}" => .to_string()

Author: dnbln

clippy_lints/src/loops/unused_enumerate_index.rs

@@ -58,7 +58,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>, arg: &'tcx
                 "remove the `.enumerate()` call",
                 vec![
                     (pat_span, snippet(cx, new_pat_span, "value").into_owned()),
-                    (arg_span, format!("{}", base_iter)),
+                    (arg_span, base_iter.to_string()),
                 ],
             );
         },