Change publish branch from master to gh-pages

.github/workflows/doxygen.yml

@@ -279,7 +279,7 @@ jobs:
           external_repository: arkhipenko/arkhipenko.github.io
           publish_dir: ./doc/html
           destination_dir: TaskScheduler
-          publish_branch: master
+          publish_branch: gh-pages
           user_name: 'github-actions[bot]'
           user_email: 'github-actions[bot]@users.noreply.github.com'
           commit_message: 'Update TaskScheduler documentation'