chore(aggregator): fix clippy warnings

Author: jpraynaud

mithril-aggregator/src/dependency_injection/builder/enablers/misc.rs

@@ -74,7 +74,7 @@ impl DependenciesBuilder {
 
     /// Builds a [SignatureConsumer]
     pub async fn build_signature_consumer(&mut self) -> Result<Arc<dyn SignatureConsumer>> {
-        let signature_consumer = SignatureConsumerNoop::default();
+        let signature_consumer = SignatureConsumerNoop;
 
         Ok(Arc::new(signature_consumer))
     }

mithril-aggregator/src/services/signature_consumer/noop.rs

@@ -5,7 +5,6 @@ use async_trait::async_trait;
 use super::SignatureConsumer;
 
 /// A no-op implementation of the [SignatureConsumer] trait that will never return signatures.
-#[derive(Default)]
 pub struct SignatureConsumerNoop;
 
 #[async_trait]