Remove sync/v4 to reduce maintenance/refactor burden.

Thank you for serving us well 🫡

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

src/api/client/sync/mod.rs

@@ -1,5 +1,4 @@
 mod v3;
-mod v4;
 mod v5;
 
 use futures::{StreamExt, pin_mut};
@@ -16,9 +15,7 @@ use tuwunel_core::{
 };
 use tuwunel_service::Services;
 
-pub(crate) use self::{
-	v3::sync_events_route, v4::sync_events_v4_route, v5::sync_events_v5_route,
-};
+pub(crate) use self::{v3::sync_events_route, v5::sync_events_v5_route};
 
 pub(crate) const DEFAULT_BUMP_TYPES: &[TimelineEventType; 6] =
 	&[CallInvite, PollStart, Beacon, RoomEncrypted, RoomMessage, Sticker];