fix(sdk): maybe_apply_new_redaction updates in-store events.

This patch updates `maybe_apply_new_redaction` so that it is able to
update/redact an event found in the store.

crates/matrix-sdk/src/event_cache/room/mod.rs

@@ -1337,7 +1337,11 @@ mod private {
                                 .expect("should have been a valid position of an item");
                         }
                         EventLocation::InStore => {
-                            todo!()
+                            self.send_updates_to_store(vec![Update::ReplaceItem {
+                                at: position,
+                                item: copy,
+                            }])
+                            .await?;
                         }
                     }
                 }