Increase version to 0.15.29 and update CHANGELOG

CHANGELOG.md

 # Changelog
 
+## 0.15.29 - 2024-08-23
+
+* Attempt to reduce test flakiness by checking whether the newly created office
+  document seems to have been opened automatically or not.
+
 ## 0.15.28 - 2024-08-23
 
 * Fix a bug in the test that would randomly click the wrong button when

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: 0.15.28
+version: 0.15.29
 icon: https://cdn.rawgit.com/docker-library/docs/defa5ffc7123177acd60ddef6e16bddf694cc35f/nextcloud/logo.svg
 dependencies:
   # https://artifacthub.io/packages/helm/nextcloud/nextcloud