Merge branch 'shell-update' into 'master'

Update Gitlab Shell to fix errors moving projects between storages

## What does this MR do?

Update Gitlab Shell to fix errors moving projects between storages

## Are there points in the code the reviewer needs to double check?

No

## Why was this MR needed?

We are unable to move projects using `ionice` because of an error in the current version of gitlab-shell. This brings the changes of https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/96 and https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/97

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Related to https://gitlab.com/gitlab-com/infrastructure/issues/513

See merge request !6751

CHANGELOG

@@ -18,6 +18,7 @@ v 8.13.0 (unreleased)
   - Keep refs for each deployment
   - Log LDAP lookup errors and don't swallow unrelated exceptions. !6103 (Markus Koller)
   - Add more tests for calendar contribution (ClemMakesApps)
+  - Update Gitlab Shell to fix some problems with moving projects between storages
   - Cache rendered markdown in the database, rather than Redis
   - Avoid database queries on Banzai::ReferenceParser::BaseParser for nodes without references
   - Simplify Mentionable concern instance methods

GITLAB_SHELL_VERSION

-3.6.3
+3.6.4