clippy: changes from nightly clippy

all of this is embeding teh var into teh format macro

src/commands/server_icon.rs

@@ -207,7 +207,7 @@ pub(crate) mod user {
 
         // the `` is so that the numbers will be rendered in monospaced font
         // the <> is to suppress the URL embed
-        let line = format!("``{}{}`` [{}](<{}>)", current_leading, times, name, url);
+        let line = format!("``{current_leading}{times}`` [{name}](<{url}>)");
 
         let length = line.len() + 1;