Use variable names directly in the format strings (#7906)

# Description

Lint: `clippy::uninlined_format_args`

More readable in most situations.
(May be slightly confusing for modifier format strings
https://doc.rust-lang.org/std/fmt/index.html#formatting-parameters)

Alternative to #7865

# User-Facing Changes

None intended

# Tests + Formatting

(Ran `cargo +stable clippy --fix --workspace -- -A clippy::all -D
clippy::uninlined_format_args` to achieve this. Depends on Rust `1.67`)

src/command.rs

@@ -157,7 +157,7 @@ pub(crate) fn parse_commandline_args(
             if call.has_flag("version") {
                 let version = env!("CARGO_PKG_VERSION").to_string();
                 let _ = std::panic::catch_unwind(move || {
-                    stdout_write_all_and_flush(format!("{}\n", version))
+                    stdout_write_all_and_flush(format!("{version}\n"))
                 });
 
                 std::process::exit(0);
@@ -190,7 +190,7 @@ pub(crate) fn parse_commandline_args(
         &mut stack,
         true,
     );
-    print!("{}", full_help);
+    print!("{full_help}");
     std::process::exit(1);
 }