Fix clippy::uninlined_format_args warning

```
warning: variables can be used directly in the `format!` string
  --> examples/priority.rs:75:13
   |
75 |             println!("{:?}", priority);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
   = note: `#[warn(clippy::uninlined_format_args)]` on by default
help: change this to
   |
75 -             println!("{:?}", priority);
75 +             println!("{priority:?}");
   |

warning: variables can be used directly in the `format!` string
  --> examples/priority.rs:77:13
   |
77 |             println!("{:?}", priority);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
help: change this to
   |
77 -             println!("{:?}", priority);
77 +             println!("{priority:?}");
   |

warning: variables can be used directly in the `format!` string
  --> benches/executor.rs:62:34
   |
62 |             group.bench_function(format!("{}::spawn_one", prefix), |b| {
   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
   = note: `#[warn(clippy::uninlined_format_args)]` on by default
help: change this to
   |
62 -             group.bench_function(format!("{}::spawn_one", prefix), |b| {
62 +             group.bench_function(format!("{prefix}::spawn_one"), |b| {
   |

warning: variables can be used directly in the `format!` string
   --> benches/executor.rs:101:34
    |
101 |             group.bench_function(format!("{}::spawn_many_local", prefix), |b| {
    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
help: change this to
    |
101 -             group.bench_function(format!("{}::spawn_many_local", prefix), |b| {
101 +             group.bench_function(format!("{prefix}::spawn_many_local"), |b| {
    |

warning: variables can be used directly in the `format!` string
   --> benches/executor.rs:139:34
    |
139 |             group.bench_function(format!("{}::spawn_recursively", prefix), |b| {
    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
help: change this to
    |
139 -             group.bench_function(format!("{}::spawn_recursively", prefix), |b| {
139 +             group.bench_function(format!("{prefix}::spawn_recursively"), |b| {
    |

warning: variables can be used directly in the `format!` string
   --> benches/executor.rs:204:34
    |
204 |             group.bench_function(format!("{}::yield_now", prefix), |b| {
    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
help: change this to
    |
204 -             group.bench_function(format!("{}::yield_now", prefix), |b| {
204 +             group.bench_function(format!("{prefix}::yield_now"), |b| {
    |

warning: variables can be used directly in the `format!` string
   --> benches/executor.rs:250:34
    |
250 |             group.bench_function(format!("{}::channels", prefix), |b| {
    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
help: change this to
    |
250 -             group.bench_function(format!("{}::channels", prefix), |b| {
250 +             group.bench_function(format!("{prefix}::channels"), |b| {
    |

warning: variables can be used directly in the `format!` string
   --> benches/executor.rs:328:34
    |
328 |             group.bench_function(format!("{}::web_server", prefix), |b| {
    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
help: change this to
    |
328 -             group.bench_function(format!("{}::web_server", prefix), |b| {
328 +             group.bench_function(format!("{prefix}::web_server"), |b| {
    |
```

Author: taiki-e

benches/executor.rs

@@ -59,7 +59,7 @@ fn running_benches(c: &mut Criterion) {
         for (group_name, multithread) in [("single_thread", false), ("multi_thread", true)].iter() {
             let mut group = c.benchmark_group(group_name.to_string());
 
-            group.bench_function(format!("{}::spawn_one", prefix), |b| {
+            group.bench_function(format!("{prefix}::spawn_one"), |b| {
                 if with_static {
                     run_static(
                         || {
@@ -98,7 +98,7 @@ fn running_benches(c: &mut Criterion) {
                 });
             }
 
-            group.bench_function(format!("{}::spawn_many_local", prefix), |b| {
+            group.bench_function(format!("{prefix}::spawn_many_local"), |b| {
                 if with_static {
                     run_static(
                         || {
@@ -136,7 +136,7 @@ fn running_benches(c: &mut Criterion) {
                 }
             });
 
-            group.bench_function(format!("{}::spawn_recursively", prefix), |b| {
+            group.bench_function(format!("{prefix}::spawn_recursively"), |b| {
                 #[allow(clippy::manual_async_fn)]
                 fn go(i: usize) -> impl Future<Output = ()> + Send + 'static {
                     async move {
@@ -201,7 +201,7 @@ fn running_benches(c: &mut Criterion) {
                 }
             });
 
-            group.bench_function(format!("{}::yield_now", prefix), |b| {
+            group.bench_function(format!("{prefix}::yield_now"), |b| {
                 if with_static {
                     run_static(
                         || {
@@ -247,7 +247,7 @@ fn running_benches(c: &mut Criterion) {
                 }
             });
 
-            group.bench_function(format!("{}::channels", prefix), |b| {
+            group.bench_function(format!("{prefix}::channels"), |b| {
                 if with_static {
                     run_static(
                         || {
@@ -325,7 +325,7 @@ fn running_benches(c: &mut Criterion) {
                 }
             });
 
-            group.bench_function(format!("{}::web_server", prefix), |b| {
+            group.bench_function(format!("{prefix}::web_server"), |b| {
                 if with_static {
                     run_static(
                         || {

examples/priority.rs

@@ -72,9 +72,9 @@ fn main() {
 
         // Spawn a task with this priority.
         tasks.push(EX.spawn(priority, async move {
-            println!("{:?}", priority);
+            println!("{priority:?}");
             future::yield_now().await;
-            println!("{:?}", priority);
+            println!("{priority:?}");
         }));
     }