Bump version 7.9.2

• Diff: https://gitlab.com/gitlab-org/gitlab-qa/compare/d62bc7d7f08dfe86a26257e33783bc3867a1fb01...7877e260d02f09a6f3c46ca32ad7b39037486de0

• Release notes:

### Fixes

- !763 Pins Minio docker image on the last compatible tag
- !763 Updates deprecated Minio credential variables
- !761 Updates nginx ssl_client_certificate path for client_ssl

### Other changes (CI, backstage)

- !764 Split ee:praefect job into 10 parallel

• 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.