Bump version 7.8.5

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/-/compare/v7.8.4...c82197710622577784c76ad67f65a67313e2abaa

• Release notes:

### New scenarios and scenario updates

- !737 Adds a new Omnibus Configuration for Object Storage with GCS

### Other changes (CI, backstage)

- !737 Adds a new job that runs the integration of Object Storage with GCS

• Checklist before merging:

  • Diff link is up-to-date.
  • Based on the diff, lib/gitlab/qa/version.rb is updated, according to SemVer.
  • Release notes are accurate.

• Checklist after merging:

  • Update the release notes for the newly created tag.