Merge branch 'fixhead' into 'next'

fix: HEAD requests should continue to produce METHOD_NOT_ALLOWED

See merge request famedly/conduit!402

src/api/client_server/sync.rs

@@ -904,7 +904,7 @@ async fn sync_helper(
         let leave_shortstatekey = services()
             .rooms
             .short
-            .get_or_create_shortstatekey(&StateEventType::RoomMember, &sender_user.as_str())?;
+            .get_or_create_shortstatekey(&StateEventType::RoomMember, sender_user.as_str())?;
 
         left_state_ids.insert(leave_shortstatekey, left_event_id);