Fix lifetime elision warnings introduced by rustc 1.89

The just-released rustc 1.89 added a new `mismatched-lifetime-syntaxes`
lint which had two warnings pop up. We fix these here.

Author: tnull

src/chain/bitcoind.rs

@@ -1155,7 +1155,7 @@ impl BlockSource for BitcoindClient {
 		}
 	}
 
-	fn get_best_block(&self) -> AsyncBlockSourceResult<(bitcoin::BlockHash, Option<u32>)> {
+	fn get_best_block(&self) -> AsyncBlockSourceResult<'_, (bitcoin::BlockHash, Option<u32>)> {
 		match self {
 			BitcoindClient::Rpc { rpc_client, .. } => {
 				Box::pin(async move { rpc_client.get_best_block().await })

src/tx_broadcaster.rs

@@ -36,7 +36,9 @@ where
 		Self { queue_sender, queue_receiver: Mutex::new(queue_receiver), logger }
 	}
 
-	pub(crate) async fn get_broadcast_queue(&self) -> MutexGuard<mpsc::Receiver<Vec<Transaction>>> {
+	pub(crate) async fn get_broadcast_queue(
+		&self,
+	) -> MutexGuard<'_, mpsc::Receiver<Vec<Transaction>>> {
 		self.queue_receiver.lock().await
 	}
 }