Upgrade gitlab-shell to v13.8.0

Full list of changes: https://gitlab.com/gitlab-org/gitlab-shell/-/blob/master/CHANGELOG

Upgrade gitlab-shell to v13.8.0
02e354aa · Stan Hu · Igor Drozdov · 0b3d69e3 · 02e354aa · 02e354aa
--- a/GITLAB_SHELL_VERSION
+++ b/GITLAB_SHELL_VERSION
-13.7.0
+13.8.0
--- a/changelogs/unreleased/sh-upgrade-gitlab-shell-13-8.yml
+++ b/changelogs/unreleased/sh-upgrade-gitlab-shell-13-8.yml
+---
+title: Upgrade gitlab-shell to v13.8.0
+merge_request: 44852
+author:
+type: other