fix clippy

Signed-off-by: Jorge Prendes <jorge.prendes@gmail.com>

Author: jprendes

src/hyperlight_host/src/metrics/mod.rs

@@ -132,7 +132,6 @@ mod tests {
         });
 
         // Convert snapshot into a hashmap for easier lookup
-        #[expect(clippy::mutable_key_type)]
         let snapshot = snapshot.into_hashmap();
 
         cfg_if::cfg_if! {