Merge branch 'update-gitlab-shell-4-1-1' into 'master'

Bump gitlab-shell to 4.1.1

This fixes a compatibility issue with Git 2.11 (#25301):

- [x] gitlab-shell MR: gitlab-org/gitlab-shell!112
- [x] CE MR: !7967
- [x] EE MR: gitlab-org/gitlab-ee!964

See merge request !8143

GITLAB_SHELL_VERSION

-4.1.0
+4.1.1

doc/update/8.14-to-8.15.md

@@ -72,7 +72,7 @@ sudo -u git -H git checkout 8-15-stable-ee
 ```bash
 cd /home/git/gitlab-shell
 sudo -u git -H git fetch --all --tags
-sudo -u git -H git checkout v4.1.0
+sudo -u git -H git checkout v4.1.1
 ```
 
 ### 6. Update gitlab-workhorse