message: Still merge stuff
diff: ### Fixed
  * <How do the end-user experience this issue? what was the impact?> ([#????](https://github.com/realm/realm-core/issues/????), since v?.?.?)
  -* Changed the signature of `Realm::async_cancel_transaction` to return a boolean indicating whether the removal of the scheduled callback was successful (true) or not (false). Previously, the method returned void. (PR [#5546](https://github.com/realm/realm-core/pull/5546))
  +* None.
  ### Breaking changes
  * `realm::Realm::Config` has been renamed to `realm::RealmConfig`.
  