fix clippy lint warnings

Author: maximopalopoli

aggregation_mode/src/backend/fetcher.rs

@@ -196,8 +196,7 @@ impl ProofsFetcher {
         match self.rpc_provider.get_gas_price().await {
             Ok(price) => Ok(price),
             Err(e1) => Err(ProofsFetcherError::GasPriceError(format!(
-                "gas price error: {:?}",
-                e1
+                "gas price error: {e1}"
             ))),
         }
     }

aggregation_mode/src/backend/mod.rs

@@ -152,11 +152,7 @@ impl ProofAggregator {
             let time_elapsed: Duration =
                 Instant::now().duration_since(start_time) + Duration::from_secs(24 * 3600);
 
-            let gas_price = self
-                .fetcher
-                .get_gas_price()
-                .await
-                .map_err(|err| FetchingProofs(err))?;
+            let gas_price = self.fetcher.get_gas_price().await.map_err(FetchingProofs)?;
 
             if self.should_send_proof_to_verify_on_chain(
                 time_elapsed,