Resolve uninlined_format_args clippy warnings

The upcomming release of Rust 1.67.0 will warn on `uninlined_format_args`.
This PR resolves that by inlining all these items.
It also looks nicer.

src/api/core/accounts.rs

@@ -705,7 +705,7 @@ async fn password_hint(data: JsonUpcase<PasswordHintData>, mut conn: DbConn) ->
                 mail::send_password_hint(email, hint).await?;
                 Ok(())
             } else if let Some(hint) = hint {
-                err!(format!("Your password hint is: {}", hint));
+                err!(format!("Your password hint is: {hint}"));
             } else {
                 err!(NO_HINT);
             }