Bump default room version to V9; per matrix spec recommendation

src/config/mod.rs

@@ -258,6 +258,6 @@ fn default_turn_ttl() -> u64 {
 }
 
 // I know, it's a great name
-fn default_default_room_version() -> RoomVersionId {
+pub fn default_default_room_version() -> RoomVersionId {
-    RoomVersionId::V6
+    RoomVersionId::V9
 }

src/service/admin/mod.rs

@@ -871,7 +871,7 @@ impl Service {
         let mut content = RoomCreateEventContent::new(conduit_user.clone());
         content.federate = true;
         content.predecessor = None;
-        content.room_version = RoomVersionId::V6;
+        content.room_version = services().globals.default_room_version();
 
         // 1. The room create event
         services().rooms.timeline.build_and_append_pdu(

src/service/globals/mod.rs

@@ -172,8 +172,8 @@ impl Service {
             .supported_room_versions()
             .contains(&s.config.default_room_version)
         {
-            error!("Room version in config isn't supported, falling back to Version 6");
+            error!("Room version in config isn't supported, falling back to default version");
-            s.config.default_room_version = RoomVersionId::V6;
+            s.config.default_room_version = crate::config::default_default_room_version();
         };
 
         Ok(s)