Update CHANGELOG and increase version to 0.15.28

CHANGELOG.md

 # Changelog
 
+## 0.15.28 - 2024-08-23
+
+* Fix a bug in the test that would randomly click the wrong button when
+  creating a new office document.
+
 ## 0.15.27 - 2024-08-21
 
 * Allow setting instance name via helm value.

Chart.yaml

@@ -4,7 +4,7 @@ description: |
   A helm chart for installing NextCloud and setting up ONLYOFFICE integration
 name: nextcloud-onlyoffice
 appVersion: NC-29.0.4-OO-7.2.2.56
-version: 0.15.27
+version: 0.15.28
 icon: https://cdn.rawgit.com/docker-library/docs/defa5ffc7123177acd60ddef6e16bddf694cc35f/nextcloud/logo.svg
 dependencies:
   # https://artifacthub.io/packages/helm/nextcloud/nextcloud