Update changelog with new rolling update logic
#### New Features & Enhancements
- Add service `--update-condition` enabling service rollback [#7513](https://github.com/habitat-sh/habitat/pull/7513) ([davidMcneil](https://github.com/davidMcneil)) <!-- 1.5.56 -->
+#### Behavioral Changes
+- When follower services restart during a rolling update all packages newer than the package the leader updated to are automatically uninstalled. This ensures that the leader and followers are running the same package. [#7556](https://github.com/habitat-sh/habitat/pull/7556) ([davidMcneil](https://github.com/davidMcneil))
+
#### Merged Pull Requests
- Fix rolling update when using track-channel update condition [#7556](https://github.com/habitat-sh/habitat/pull/7556) ([davidMcneil](https://github.com/davidMcneil)) <!-- 1.5.69 -->
- only stop the studio container at the end of the docker studio supervisor test [#7560](https://github.com/habitat-sh/habitat/pull/7560) ([mwrock](https://github.com/mwrock)) <!-- 1.5.68 -->
