Prepare 15.11.9 release for gitlab-jh
Release issue: https://jihulab.com/gitlab-cn/release/tasks/-/issues/76
Summary
This MR prepares 15-11-stable-jh
for 15.11.9
.
Automated cherry-picking
Merge requests labeled ~"Pick into 15.11" should be automatically picked into this MR.
Manual intervention
If merge requests cannot be picked automatically they have to be created manually targeting 15-11-stable-jh-patch-9
.