changelog.md: Document v1.54.3

Signed-off-by: Tobias Knöppler <6317548+theCalcaholic@users.noreply.github.com>

Author: theCalcaholic

changelog.md

@@ -1,5 +1,11 @@
 # NextcloudPi Changelog
 
+## [v1.54.3](https://github.com/nextcloud/nextcloudpi/tree/v1.54.3) (2024-08-11) Improved Nextcloud (auto) updates
+
+### Changes
+
+- Nextcloud updates now automatically determine the next valid version to upgrade to. Auto updates always update to the latest minor version.
+
 ## [v1.54.2](https://github.com/nextcloud/nextcloudpi/tree/v1.54.2) (2024-05-08) Fixes for ncp-dist-upgrade (bookworm)
 
 ### Fixes