State-reset and security mitigations.

Upgrade Ruma to present.

The following are intentionally benign for activation in a later commit:

- Hydra backports not default.
- Room version 12 not default.
- Room version 12 not listed as stable.

Do not enable them manually or you can brick your database.

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

src/api/server/send_join.rs

@@ -354,6 +354,7 @@ pub(crate) async fn create_join_event_v2_route(
 		create_join_event(&services, body.origin(), &body.room_id, &body.pdu)
 			.boxed()
 			.await?;
+
 	let room_state = create_join_event::v2::RoomState {
 		members_omitted: false,
 		auth_chain,