Update to 2024 edition (#2001)

* Update to 2024 edition

* Update to 2024 edition; fmt, use<> and remove refs

* async functions

testing/integration-tests/src/utils/node_proc.rs

@@ -9,8 +9,8 @@ use std::time::Duration;
 use substrate_runner::SubstrateNode;
 use subxt::backend::rpc::reconnecting_rpc_client::{ExponentialBackoff, RpcClientBuilder};
 use subxt::{
-    backend::{chain_head, legacy, rpc},
     Config, OnlineClient,
+    backend::{chain_head, legacy, rpc},
 };
 
 // The URL that we'll connect to for our tests comes from SUBXT_TEXT_HOST env var,
@@ -62,7 +62,7 @@ where
 
     pub async fn restart(mut self) -> Self {
         tokio::task::spawn_blocking(move || {
-            if let Some(ref mut proc) = &mut self.proc {
+            if let Some(proc) = &mut self.proc {
                 proc.restart().unwrap();
             }
             self