Update gitlab-exporter from v11.2.0 to v11.11.0

What does this MR do?

This updates a number of dependencies and adds an Elasticsearch probe, but this probe is not configured at the moment.

This brings the version up-to-date with Omnibus.

Omnibus update: gitlab-org/omnibus-gitlab!5915 (merged)

Diff: https://my.diffend.io/gems/gitlab-exporter/11.2.0/11.11.0

Related issues

• https://gitlab.com/gitlab-org/gitlab-exporter/-/issues/87
• https://gitlab.com/gitlab-org/gitlab-exporter/-/issues/86

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion.

Required

• Merge Request Title and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for omnibus-gitlab opened: gitlab-org/omnibus-gitlab!5915 (merged)