Upgrade Elasticsearch version in GDK

What does this merge request do and why?

Upgrade Elasticsearch to 8.11.4 as part of Elasticsearch upgrade to 8.11.4 (gitlab-org/search-team/team-tasks#170 - closed)

How to set up and validate locally

1. make sure elasticsearch is enabled in gdk.yml
2. run make elasticsearch-setup
3. verify that the elasticsearch version is updated: curl http://localhost:9200

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• Announcement added, if change is notable.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.