Optimize Pdu prev_events and auth_events containers.

Signed-off-by: Jason Volk <jason@zemos.net>

src/service/rooms/event_handler/handle_prev_pdu.rs

@@ -1,5 +1,6 @@
 use std::{ops::Range, time::Duration};
 
+use futures::FutureExt;
 use ruma::{
 	CanonicalJsonObject, EventId, MilliSecondsSinceUnixEpoch, RoomId, RoomVersionId, ServerName,
 };
@@ -62,6 +63,7 @@ pub(super) async fn handle_prev_pdu(
 		room_version,
 		create_event_id,
 	)
+	.boxed()
 	.await?;
 
 	Ok(())

src/service/rooms/event_handler/upgrade_outlier_pdu.rs

@@ -212,13 +212,11 @@ pub(super) async fn upgrade_outlier_to_timeline_pdu(
 			.services
 			.state_compressor
 			.save_state(room_id, new_room_state)
-			.boxed()
 			.await?;
 
 		self.services
 			.state
 			.force_state(room_id, shortstatehash, added, removed, &state_lock)
-			.boxed()
 			.await?;
 	}